求不规则动词表请把汉语意思和过去分词和过去时写上.

假设数小方格的前提是知道小方格的面积,一般来说每个小方格边长为1,面积为1,通过对不规则图形的小方格划分填补,就可以得出不规则图形面积了.

7ml满倒入5ml空,把5ml倒掉再把7ml中剩的2ml倒入5ml,7ml盛满再倒入5ml中,这样7ml中还剩4ml,倒入空的5ml中,最后用7ml满的把已经有4ml的5ml杯倒满,这样7ml杯中还有6ml水.

规则动词 过去式 过去分词 分类：学习
G
get got gotten/ got
give gave given
go went gone
grind ground ground
grow grew grown
H
hang hung hung
have had had
hear heard heard
hide hid hidden
hit hit hit
hold held held
hurt hurt hurt
I
input input input
inset inset inset
interbreed interbred interbred
interweave interwove interwoven
K
keep kept kept
kneel knelt/ kneeled knelt/ kneeled
knit knit/ knitted knit/ knitted
know knew known
L
lay laid laid
lead led led
lean leaned/ leant leaned/ leant
leap leapt/ leaped leapt/ leaped
learn learned/ learnt learned/ learnt
leave left left
lend lent lent
let let let
lie lay lain
light lit / lighted lit / lighted
lose lost lost
M
make made made
mean meant meant
meet met met
mishear misheard misheard
mislay mislaid mislaid
mislead misled misled
misread misread misread
misspell misspelled/ misspelt misspelled/ misspelt
mistake mistook mistaken
misunderstand misunderstood misunderstood
mow mowed mowed/ mow
O
outbid outbid outbid
outdo outdid outdone
outgrow outgrew outgrown
outrun outran outrun
outsell outsold outsold
overcast overcast overcast
overcome overcame overcome
overdo overdid overdone
overdraw overdrew overdrawn
overeat overate overeaten
overhang overhung overhung
overhear overheard overheard
overlay overlaid overlaid
overlie overlay overlain
overpay overpaid overpaid
override overrode overridden
overrun overran overrun
oversee oversaw overseen
oversell oversold oversold
overshoot overshot overshot
oversleep overslept overslept
overtake overtook overtaken
overthrow overthrew overthrown

对于规则四边形,一定是一条对称线(轴对称/旋转对称线).

因为任何一个不规则图形都有重心,通过重心的直线就平分它的面积

还有支撑法,即用木棍之类的东西支撑,找到两条过物体重心的直线,交点就是物体重心

圆柱形容器的底面半径是
10÷2＝5厘米
这块石头的体积是
5×5×3.14×3＝235.5立方厘米

1数学的问题,连接各个对角线,交点就是重心 2物理的问题.把它用线在空中挂起来.沿线在图形上画出来,再找另一点挂起,再画条直线,反复做这个步骤,交点就是重心

无穷个

去四个边的中点得到一个四边形,面积委员四边形一半

去四个边的中点得到一个四边形,面积委员四边形一半

1、look-looked
2、live-lived
3、stop-stopped
4、carry-carried
5、hope-hoped
6、trip-tripped
7、call-called
8、finish-finished
9、want-wanted
10、are-were
11、go-went
12、have-had
13、do-did
14、get-got
15、come-came
16、say-said
17、see-saw
18、put-put
19、eat-ate
20、take-took
21、read-read
22、catch-caught
23、listen-listened
24、arrive-arrived
25、plan-planned
其实这种类型的题很好做啊!是有规律的啊!一般情况都加ed
还有就是双写最后一个字母加ed
还有就是特殊的情况了你要熟记即可掌握
希望这样的题以后你可以自己处理!

..
我虽然不是物理学家,但至少是物理学习者,我可以回答lz的问题.
ls说的很对,结论就是假设、实验和论证后得出的.有误差很正常,只要误差控制在一定程度之内,比如千分之一或万分之一的误差都很正常.
微积分是人类发明的伟大数学工具,还有一些近似的计算公式,这些的误差都比较大,误差估计在百分之五到百分之一,例如当x

1、记录时,刻针振动把声音变成“沟纹”记下来；放音时,振针的振动,再把“沟纹”转变为声音.
2、
L/V1-L/V2=t
L/340-L/5200=2
解出,L≈727.6m
3、振动
4、
S/V1-S/V2=t
S/340-S/(3.0*10^8)=5
解出,S=1700m
5、振动、空气

条件不足,此题无解

课本背后有动词的不规则变化,绝大部分是一般过去式

你说的这个“不规则”是怎么不规则法?
如果是“棱台”或“圆锥台”,可以看做是棱锥或圆锥削掉一个尖儿而形成.
计算体积时,再把这个尖儿补上去就行了.此法可称为“割补法”

用微积分求!

25乘8乘（15减10）等于1000

（1） AAA型（动词原形、过去式、过去分词同形）
cost（花费） cost cost
cut（割） cut cut
hit（打） hit hit
hurt 伤害） hurt hurt
let（让） let let
put（放） put put
read （读） read read
spread (伸展/ 传播)
spread spread

(2) AAB型（动词原形与过去式同形）
beat（跳动） beat beaten

(3) ABA型（动词原形与过去分词同形）
become（变成）became become
come（来） came come
run（跑） ran run

(4) ABB型（过去式与过去分词同形）
dig（挖） dug dug
get（得到） got got
hang（吊死） hanged hanged
hang（悬挂） hung hung
hold（抓住） held held
lay (产卵) laid laid
shine（照耀） shone shone
sit（坐） sat sat
win （赢） won won
meet（遇见） met met
keep （保持） kept kept
sleep（睡） slept slept
sweep（扫） swept swept
feel（感觉） felt felt
flee (逃跑) fled fled
smell（闻） smelt smelt
leave（离开） left left
build（建设） built built
lend（借出） lent lent
send （传送) sent sent
spend（花费） spent spent
sink (沉下)sunk /sank snuk /sunken
lose （丢失） lost lost
burn （燃烧） burnt burnt
learn（学习） learnt learnt
mean（意思是）meant meant
catch（抓住） caught caught
teach（教) taught taught
bring(带来） brought brought
fight （战斗) fought fought
buy（买） bought bought
think（想） thought thought
hear （听见） heard heard
sell（卖） sold sold
tell（告诉） told told
say（说） said said
find（找到) found found
feed ( 饲养 )fed fed
have/has(有) had had
make（制造) made made
stand（站） stood stood
smell （闻）smelled /smelt smelled /smelt
stick (粘贴 /刺) stuck stuck
spell (拼写)spelt/spelled spelt/spelled
spit (吐唾沫）spat spat
understand(明白)understood understood

(5) ABC型（动词原形、过去式与过去分词三者不同形）
begin（开始）began begun
drink（喝） drank drunk
hide （躲藏）hid hidden
ring（铃响） rang rung
sing （唱） sang sung
swim（游泳） swam swum
blow（吹） blew blown
draw （画） drew drawn
fly（飞） flew flown
grow（生长） grew grown
know（知道） knew known
throw（投掷）threw thrown
show（出示） showed shown
break（打破）broke broken
choose（选择)chose chosen
forget（忘记)forgot forgotten (forgot)
freeze （结冰／ 凝固）froze frozen
speak（说） spoke spoken
wake（醒） woke woke
drive（驾驶）drove driven
eat（吃） ate eaten
fall（落下） fell fallen
give（给） gave given
rise（升高） rose risen
take（取） took taken
mistake(弄错)mistook mistaken
ride（骑） rode ridden
write（写） wrote written
do（做） did done
go（去） went gone
lie（平躺） lay lain
see（看见） saw seen
wear （穿） wore worn
be ( am, is, are )（是）was, were been

不规则动词过去式和过去分词巧记方法

一、原形、过去式和过去分词的词形和读音都相同的单词,结尾字母一般是t或d.如：

cut-cut-cut, hit-hit-hit, put-put-put, cost-cost-cost, let-let-let, shut-shut-shut, set-set-set, hurt-hurt-hurt, spread-spread-spread

特殊：动词read的过去式和过去分词虽然词形与原形一致,read-read-read,但发音分别是[ri:d]-[red]-[red].

二、有些动词的过去分词与原形是一样的.如：

come-came-come, become-became-become, run-ran-run, overcome-overcame-overcome

三、有些动词的过去式和过去分词相同.如：

1. 把单词结尾的字母d改为t.如：

lend-lent-lent, spend-spent-spent, send-sent-sent

2. 改变单词中间元音字母.如：

sit-sat-sat, win-won-won, shine-shone-shone, hold-held-held

3. 以eep结尾的动词,把eep改为ept.如：

keep-kept-kept, sleep-slept-slept, sweep-swept-swept

4. 过去式和过去分词都以augh或ough结尾的动词.如：

buy-bought-bought, fight-fought-fought, think-thought-thought, bring-brought-brought, teach-taught-taught, catch-caught-caught

5. 有的以ay结尾的动词,在过去式和过去分词中把ay变成aid.如：

say-said-said, lay-laid-laid, pay-paid-paid

6. 另有一些其它形式的变化.如：

have-had-had, learn-learnt-learnt, leave-left-left, lose-lost-lost, make-made-made, meet-met-met, feel-felt-felt

四、有些动词原形中含有字母i,在过去式中变i为a,在过去分词中变i为u.如：

begin-began-begun, sing-sang-sung

五、以字母ow或aw结尾的动词,在变成过去式时,通常把元音字母变成e,在变成过去分词时,通常只在词尾加n.如：

blow- blew- blown, draw-drew-drawn, grow-grew-grown, throw-threw-thrown, know-knew-known

六、有些动词的过去分词是在原形词尾加n或en,变成以en结尾的单词.如：

Rise-rose-risen, arise-arose-arisen, give-gave-given, take-took-taken, fall-fell-fallen, drive-drove-driven, eat-ate -eaten

特殊： write-wrote-written, speak-spoke-spoken, ride-rode-ridden, get-got-gotten
1. cut cut cut
2. hit hit hit
3. let let let
4. put put put
5. cost cost cost
6. hurt hurt hurt
7. read read read
A B B
1. lend lent lent
2. spend pent spent
3. build built built
4. sleep slept slept
5. keep kept kept
6. leave left left
7. feel felt felt
8. lose lost lost
9. sit sat sat
10. meet met met
11. tell told told
12. sell sold sold
13. hold held held
14. make made made
15. find found found
16. have had had
17. say said said
18. stand stood stood
19. hear heard heard
20. mean meant meant
21. win won won
22. bring brought brought
23. buy bought bought
24. think thought thought
25. teach taught taught
26. catch caught caught

A B A
1. run ran run
2. come came come
3. become became become

A B C
1. grow grew grown
2. know knew known
3. throw threw thrown
4. blow blew blown
5. draw drew drawn
6. drive drove driven
7. wake woke woken
8. give gave given
9. take took taken
10. mistake mistook mistaken
11. see saw seen
12. write wrote written
13. ride rode ridden
14. eat ate eaten
15. fall fell fallen
16. break broke broken
17. choose chose chosen
18. speak spoke spoken
19. forget forgot forgotten
20. do did done
21. go went gone
我上gxenglish的
不规则动词表（初中生用）
Infinitive Past tense Past participle
be
am, is was been
are were been
become became become
begin began begun
break broke broken
bring brought brought
build built built
burn burned/burnt burned/burnt
buy bought bought
can could —
catch caught caught
choose chose chosen
come came come
cost cost cost
cut cut cut
do did done
draw drew drawn
dream dreamed/dreamt dreamed/dreamt
drink drank drunk
drive drove driven
eat ate eaten
fall fell fallen
feel felt felt
fight fought fought
find found found
fly flew flown
forget forgot forgotten
get got got
give gave given
go went gone
grow grew grown
have/has had had
hear heard heard
hide hid hidden
hit hit hit
hold held held
hurt hurt hurt
keep kept kept
know knew known
learn learned/learnt learned/learnt leave left left
lend lent lent
let let let
lose lost lost
make made made
may might —
mean meant meant
meet met met
pay paid paid
put put put
read read read
ride rode ridden
ring rang rung
rise rose risen
run ran run
say said said
see saw seen
sell sold sold
send sent sent
set set set
shake shook shaken
shall should —
shine shone shone
shoot shot shot
show showed shown
shut shut shut
sing sang sung
sit sat sat
sleep slept slept
smell smelled/smelt smelled/smelt
speak spoke spoken
spell spelled/spelt spelled/spelt
spend spent spent
stand stood stood
steal stole stolen
stick stuck stuck
swim swam swum
take took taken
teach taught taught
tear tore torn
tell told told
think thought thought
throw threw thrown
understand understood understood
wake woke waken
wear wore worn
will would —
win won won
write wrote written

原形 过去式 过去分词
baby-sit临时照顾 baby-sat baby-sat
be(am/is/are)是 was/were been
beat 击打 beat beaten
become 变成 became become
begin 开始 began begun
bend 使弯曲 bent bent
bet 赌 bet bet
bite 咬 bit bitten/bit
blow 吹 blew blown
break 打破 broke broken
bring 拿来 brought brought
build 建造 built built
burn 燃烧 burnt/burned burnt/burned
buy 买 bought bought
can 能 could
cast 抛 cast cast
catch 捕捉 caught caught
choose 选择 chose chosen
come来 came come
cost花费 cost cost
cut割 cut cut
deal 分配 dealt dealt
dig挖 dug dug
do /does做 did done
draw画 拉 拖 drew drawn
dream 做梦 dreamed/dreamt dreamed/dreamt
drink 喝 drank drunk
drive驾驶 drove driven
eat吃 ate eaten
fall 掉落 fell fallen
feed喂 fed fed
feel 触摸 felt felt
fight作战 fought fought
find 找出 found found
fly 飞 flew flown
forbid 禁止 forbade/forbad forbidden
forget 忘记 forgot forgot/forgotten
forgive原谅 forgave forgiven
freeze 结冰 froze frozen
get 得到 got got
give给 gave given
go 去 went gone
grow 成长 grew grown
hang 挂/绞死 hung/hanged hung/hanged
have/has 有 had had
hear 听到 heard heard
hide 隐藏 hid hidden/hid
hit 打 hit hit
hold 拿住 held held
hurt 受伤 hurt hurt
keep保持 kept kept
know 知道 knew known
lay 放置 laid laid
lead 引导 led led
learn 学习 learnt/learned learnt /learned
leave离开 left left
lend 借贷 lent lent
let让 let let
lie躺 lay lain
light 点着 lit/lighted lit/lighted
lose遗失 lost lost
原形 过去式 过去分词
make制作 made made
may可以 might
mean表…意思 meant meant
meet遇到 met met
mistake误认 mistook mistaken
misunderstand误会misunderstood misunderstood
pay支付 paid paid
prove证明 proved proved/proven
put放置 put put
quit放弃 quit/quitte quit/quitted
read读 read read
rebuild改建 rebuilt rebuilt
retell复述 retold retold
rid 免除 rid/ridded rid/ridded
ride骑 rode ridden
rise上升 rose risen
run跑 ran run
saw锯 sawed sawed/sawn
say说 said said
see看 saw seen
seek寻觅 sought sought
sell卖 sold sold
send送/寄 sent sent
set安置 set set
sew缝合 sewed sewn/sewed
shake摇 shook shaken
shall将 should
shine发光 shone shone
擦亮 shined shined
shoot放（炮） shot shot
show显露 showed showed/shown
sing 唱歌 sang sung
sink下沉 sank/sunk sunk/sunken
sit坐 sat sat
sleep睡 slept slept
smell发出气味 smelt smelt
sow种植 sowed sown/sowed
speak说 spoke spoken
spell拼写 spelt/spelled spelt/spelled
spend花费 spent spent
spit吐出 spat/spit spat/spit
spring跳跃 sprang/sprung sprung
stand站立 stood stood
steal偷 stole stolen
sweep打扫 swept swept
swim游泳 swam swum
take拿 took taken
teach教 taught taught
tear撕裂 tore torn
tell告诉 told told
think思考 thought thought
throw投/扔 threw thrown
understand了解 understood understood
wake醒着 woke/waked waked/woken
wear穿着 wore worn
wet淋湿 wet/wetted wet/wetted
will将 would
win获胜 won won

用阿基米德的方法,放入一个装水的杯子中,看看水上升了几厘米,求出杯子的底面积,*上升水的高度.相信你一定行.

解题思路：以O为原点，OA所在的直线为y轴，建立直角坐标系，由已知条件解得抛物线方程为y2=x，由题意得S=（4-t2）（2+t），由此利用导数性质能求出函数S=f（t）的大致图象．

以O为原点，OA所在的直线为y轴，建立直角坐标系，
令抛物线方程为y²=2px，（p＞0）
∵AB⊥BC，OA∥BC，AB=PC=2OA=4，
∴C（4，2），
把C（4，2）代入抛物线方程，得p=[1/2]，
∴抛物线方程为y²=x，
由题意得P（t²，t），（0≤t＜2），
∴S=（4-t²）（2+t）
=-t³-2t²+4t+8，
∴S′=-3t²-4t+4，
解S′=0，得t=[2/3]，当t∈（0，[2/3]）时，S′＞0；
当t∈（[2/3]，2）时，S′＜0，
∴当t=[2/3]时，S取最大值为[256/27]．
又当t=0时，y=8，
故选：B．

点评：
本题考点： 利用导数研究函数的单调性．

考点点评： 本题考查函数图象的判断，是中档题，解题时要认真审题，注意导数性质的灵活运用．

是6,边是按线段数来算的,不能因为看起来两个线段连接起来了就算两个边

还有其他要求吗?如=号可以换地方吗?另外问下是小学还是初中高中的题,根据不同的学生我给你不同的解法
先给你一个答案16×8+106=18×11+6×6

拿个已知体积的杯子,灌满水
把橡皮丢进去,溢出的水的体积就是橡皮的体积

先用一个细绳子吊起来,到它静止时,沿绳子的延长线自然过重心,在换一个角度吊起来,延长线也过重心,两延长线的交点便是了

新规范3.4.3条规定,竖向不规则的建筑结构,其薄弱层的地震剪力应乘以1.15的增大系数：新高规5.1.14条规定,楼层侧向刚度小于上层的70%或其正二层平均值的80%时,该楼层地震剪力应乘1.15增大系数；新规范3.4.3条规定,坚向不规则的建筑结构,竖向抗侧力构件不连续时,该构件传递给水平转换构件的地震内力应乘以1.25-1.5的增大系数.

参考




四个全等三角形就不可能了!
设1个面积为1.
共6个,则面积为6,
如果分成4个全等三角形,那么每个面积为1.5
就是三个正方形的对角线
可是第一竖只有2个三角形,
所以无法分成4个全等三角形!

1.把5升桶里的水倒入3升桶里,那么5升桶里剩下2升水,2.把上面5升桶里的2升水倒入3升空桶里,3.再把5升桶里的水倒入刚才只有2升水的3升桶里,这样,5升桶里正好只剩4升水了.楼主,这样够清楚了吧,前面的朋友大都答对了,你到底是"白内障"还是"青光眼"啊,怎么都不采纳哦~`

不行虽然知道周长一定,但是在同一周长条件下,圆的面积大过正方形面积,推出;周长相等,图形面积不一定相等.既只知道周长求不出面积. 即使是有图形（不特殊）,但无其它信息,面积仍不可求.
满意请采纳

不规则动词变化
1.A---A---A型（现在式、过去式和过去分词同形）
cost x09cost x09cost 花费
cut cut cut 割,切
hit x09hit x09hit 打
let x09x09letx09let 让
put x09put x09put 放下
read x09read x09read 读
hurt x09hurt x09hurt 伤
2.A---A---B型（现在式和过去式同形）
beat x09beat x09beaten 打
3.A---B---A型（现在式和过去分词同形）
come x09came x09come 来
become x09became become 变
run x09ran x09run 跑
4.A ---B ---B型
（1）在动词原形后加一个辅音字母（e）d或t构成过去式或过去分词.
burn x09burnt x09burnt 燃烧
learn learned/learnt learned/learnt 学习
mean x09meant x09meant 意思
hear x09heard x09heard 听见
（2）把动词原形的最后一个辅音字母“d”改为“t” 构成过去式或过去分词.
build x09built x09built 建筑
lend x09lent x09lent 借给
send x09sent x09sent 送
spend x09spent x09spent 花费
（3）其他
pay x09paid x09paid 付
lay x09x09laid x09laid 下蛋
lose x09lost x09lost 失去
say x09said x09said 说
bring x09brought brought 带来
buy x09boughtx09bought 买
think x09thought thought 想
sleep x09slept x09slept 睡
keep x09kept x09kept 保持
sweepx09swept x09swept 扫
stand x09stood x09stood 站
understand understood understood 明白
win x09won x09won 得胜
shine shone/shined shone/shined 发光
catch x09caught x09caught 抓住
teach x09taught x09taught 教
feel x09felt x09felt 觉得
fight x09fought x09fought 战斗
find x09found x09found 发现
get x09got x09got/gotten得到
hang x09hanged hanged 绞死,吊死
hang x09hung hung 挂
have x09had x09had 有
hold x09held x09held 盛,握
leave x09left x09left 离开
make x09made x09made 制造
meet x09met x09met 遇见
sell x09sold x09sold 卖
shoot x09shot x09shot 射击
tell x09told x09told 告诉
smell smelt/smelled smelt/smelled 嗅,闻
sit x09x09sat x09sat 坐
dig x09dug x09dug 挖
5.A---B---C型（现在式、过去式和过去分词都不相同）
（1）在动词原形后加-n或-en构成过去分词.
eat x09ate x09eaten 吃
fall x09fell x09fallen 落下
steal x09stole x09stolen 偷
give x09gave x09given 给
freeze x09froze x09frozen 冻结
take x09took x09taken 拿
see x09saw x09seen 看见
write x09wrote x09written 写
ride x09rode x09ridden 骑
drive x09drove x09driven 驾驶
throw x09threw x09thrown 抛,扔
blow x09blew x09blown 吹
grow x09grew x09grown 生长
know x09knew x09known 知道
fly x09x09flew x09flown 飞
draw x09drew x09drawn 拉,绘画
show x09showed shown 展示
（2）过去式加-n或-en构成过去分词.
speak x09spoke x09spoken 说话
break x09broke x09broken 破碎,折断
wake waked/ woke waked/ woken 醒
choose x09chose x09chosen 选择
forget x09forgot x09forgot /forgotten 忘记
（3）变单词在重读音节中的元音字母“i”分别为“a”（过去式）和“u”（过去分词）.
begin x09began x09begun 开始
ring x09rang x09rung 按铃
sing x09sang x09sung 唱
sink x09sank x09sunk 沉
swim x09swam x09swum 游泳
drink x09drank x09drunk 饮
（4）其他不规则动词的变化.
be(am,is) x09was been 是
be(are) x09were x09been 是
do x09x09did x09done 做
go x09x09went x09gone 去
lie x09x09lay x09lain 躺/位于
lie x09x09lied x09lied 说谎
wear x09x09 wore x09x09 worn 穿

把酒倒入其中一只杯子,再把有酒的杯子里的酒倒入没酒的杯子,分出杯子大小,然后每次先倒满小点杯子,再把小杯子的酒倒入大点的杯子,再倒满小杯子,这样每次两个人喝的都差不多了.

要看你怎么画的图
如果你用的是实际尺寸,那么现在这个就是实际的面积,最后你还要根据你的单位进行换算到平方米
如果你缩小100倍画的,那么面积就要X10000

这个问题还真没深究过,不过也不难解决,完全可以再画个简单的不规则图形（最好包括一条直线）,再照你所说的方法放大十倍,任意量一下放大后的直线长度和原来的比较一下,问题就可以解决啦.
个人感觉一般放大是放大图形的边长,如果是规则图形,面积只与边长有关,肯定是和边长放大倍数一样啦,不规则图形也能化成规则图形,所以道理应该和规则的一样

特点：过重心的任意一条直线能够将该不规则图形划分为等面积的两块图形.
验证方法：下面是一些寻找形状不规则或质量不均匀物体重心的方法.
a.悬挂法 只适用于薄板（不一定均匀）.首先找一根细绳,在物体上找一点,用绳悬挂,划出物体静止后的重力线,同理再找一点悬挂,两条重力线的交点就是物体重心.
b.支撑法 只适用于细棒（不一定均匀）.用一个支点支撑物体,不断变化位置,越稳定的位置,越接近重心. 一种可能的变通方式是用两个支点支撑,然后施加较小的力使两个支点靠近,因为离重心近的支点摩擦力会大,所以物体会随之移动,使另一个支点更接近重心,如此可以找到重心的近似位置.
c.针顶法 同样只适用于薄板.用一根细针顶住板子的下面,当板子能够保持平衡,那么针顶的位置接近重心. 与支撑法同理,可用3根细针互相接近的方法,找到重心位置的范围,不过这就没有支撑法的变通方式那样方便了.
d.用铅垂线找重心（任意一图形,质地均匀） 用绳子找其一端点悬挂,后用铅垂线挂在此端点上（描下来）.而后用同样的方法作另一条线.两线交点即其重心.

1）原形、过去式、过去分词相同：
cast/ cost/ cut/ hit/ hurt/ let/ put/ broadcast/
burst/ read/ red/ set/ shut/ spread/ thrust/ upset
（2）原形、过去式相同,过去分词不同：
beat/ beat/ beaten
（3）原形、过去分词相同,过去式不同：
come/ came/ come become/ became/ become
run/ ran/ run overcome/ overcame/ overcome
（4）原形不同,过去式,过去分词相同：
feel/ felt/ felt sleep/ slept/ slept
leave/ left/ left smell/ smelt/ smelt
keep/ kept/ kept creep/ crept/ crept
kneel/ knelt/ knelt sweep/ swept/ swept
spell/ spelt/ spelt weep/ wept/ wept
catch/ caught/ caught fight/ fought/ fought
teach/ taught/ taught think/ thought/ thought
stand/ stood/ stood lay/ laid/ laid
understand/ understood/ understood pay/ paid/ paid
bleed/ bled/ bled say/ said/ said
feed/ fed/ fed stick/ stuck/ stuck
lead/ led/ led strike/ struck/ struck
meet/ met/ met tell/ told/ told
learn/ learnt/ learnt sell/ sold/ sold
learned/ learned win/ won/ won
burn/ burnt/ burnt wind/ wound/ wound
burned/ burned have（has）/ had/ had
deal/ dealt/ dealt hear/ heard/ heard
mean/ meant/ meant lean/ leant/ leant
dream/ dreamt/ dreamt leaned/ leaned
bend/ bent/ bent shine/ shone/ shone
build/ built/ built shoot/ shot/ shot
lend/ lent/ lent show/ showed/ shown
spend/ spent/ spent / showed
flee/ fled/ fled sit/ sat/ sat
speed/ sped/ sped lose/ lost/ lost
/ speeded/ speeded dig/ dug/ dug
spit/ spit/ spit hold/ held/ held
/ spat/ spat get/ got/ got（AmE gotten）
bring/ brought/ brought find/ found/ found
buy/ bought/ bought make/ made/ made
light/ lit/ lit / lighted/ lighted
（5）三者均不同：
drive/ drove/ driven blow/ blew/ blown
rise/ rose/ risen fly/ flew/ flown
wake woke/ woken grow/ grew/ grown
do/ did/ done know/ knew/ known
go/ went/ gone throw/ threw/ thrown
see/ saw/ seen prove/ proved/ proven
eat/ ate/ eaten break/ broke/ broken
fall/ fell/ fallen choose/ chose/ chosen
give,gave given freeze/ froze/ frozen
shake/ shook/ shaken speak/ spoke/ spoken
take/ took/ taken steal/ stole/ stolen
mistake/ mistook/ mistaken weave/ wove/ woven
forbid/ forbad/ forbidden forget/ forgot/ forgotten
begin/ began/ begun hide/ hid/ hidden
drink/ drank/ drunk ride/ rode/ ridden
ring/ rang/ rung swim/ swam/ swum
sing/ sang/ sung write/ wrote/ written
sink/ sank/ sunk wear/ wore/ worn
（6）相同动词因其过去式、过去分词有两形式而产生不同词义：
speed过去式、过去分词有两种：
sped/ sped 快行 speeded/ speeded加速
light过去式,过去分词有两种：
lit/ lit 点着（表语） lighted/ lighted 供电,点燃的（定语）
shine过去式、过去分词有两种：
shone/ shone/ 照耀 shined/ shined擦亮
hang过去式、过去分词有两种：
hung/ hung 悬挂 hanged/ hanged绞死
（7）drunken,stricken,sunken已转为形容词常作定语
sot酒鬼 in manner摇摇晃晃地
（8）lie躺卧lay/ lain/ lying（现在分词）
lie 撒谎 lied/ lied/ lying
lay 放,下蛋laid/ laid/ laying
（9）come,become,overcome属不规则变化,但welcome属规则动词,其过去式、过去分词为：welcomed,welcomed
（10）fly,blow不是规则变化,但flow（流）是规则变化,过去式、过去分词为flowed,flowed.
（11） find发现 found found
found 创建 founded founded
wind 绕 wound wound
wound 伤害 wounded wounded
see 看见 saw seen
saw 锯 sawed sawed
bear 作“出生”,过去分词有两种：born,borne,
borne 用于have之后及带有by的被动句中；
born用于be born in/ on/ at中.
作“出生”,以外意义,其形式为bear/ bore/ borne忍受.

1put__ cut__ hit__ read__ let__beat__ hurt__ cost和动词原形同型
2kept,slept,swept去掉e加t
3taught,caught,加aught
4brought,bought,thought,加ought
5began,drank,rang,sang,swam,sat,变i为a
6lent,sent,spent,built,变d为t
7sold,told,变ell为old
8,said,paid,变y为id
9met,fed,去掉一个e
10grew,knew.threw,flew.变o为e

I was happy yesterday.
He rode to school yesterday.
He helped that old man last night.
They were not very happy last night.
Did he go to the park last week?
在学一般过去时吗?

第二单元动词的不规则变化? reckon 动词过去式:reckoned 过去分词:reckoned 现在分词:reckoning 第三人称单数:reckons sound 名词:soundness 副词:soundly 形容词比较级:sounder 最高级:soundest 动词过去式:sounded 过去分词:sounded 现在分词:sounding 第三人称单数:sounds 形容词:soundable dream动词过去式:dreamed/dreamt 过去分词:dreamed/dreamt 现在分词:dreaming 第三人称单数:dreams sell动词过去式:sold 过去分词:sold 现在分词:selling 第三人称单数:sells 形容词:sellable taste动词过去式:tasted 过去分词:tasted 现在分词:tasting 第三人称单数:tastes 形容词:tastable climb动词过去式:climbed 过去分词:climbed 现在分词:climbing 第三人称单数:climbs 形容词:climbable name名词:namer 动词过去式:named 过去分词:named 现在分词:naming 第三人称单数:names 形容词:namable 推荐你去酷兔英语~~~~乐乐你多给些分啊~~找找不容易

上面的回答都不完美.
1.假石已没入,所以上升的部分就是石头的体积.需要用地面积乘上升的部分.
5×3×0.6=9立方分米
答：假山石的体积是9立方分米
2.因为融化后三块铁的总体积不会变,所以我们要用这个不变量去求变量,也就是正方体的表面积.
首先需要把它们的总体积算出来.也就是也用表面积算出各正方体的棱长,因为正方体的表面积等于棱长×棱长×6.所以棱长=表面积/6再开方.
用这个方法求得各正方体的棱长分别是3 4 5厘米.
然后3×3×3+4×4×4+5×5×5=216（立方厘米）
谁的立方等于216呢?就是6,求得融合后大正方体的体积
然后求得其棱长是6cm（6的立方是216）
因此6×6×6＝216（平方厘米）
3.这道题大家都做错了.
原理还是用不变量求变量,因为水的体积是不变的,所以我们先求出来,然后再除以左边的地面.
第一：注意单位换算!1分米=10厘米,问得是厘米,所以首先要把单位换成一样的.
第二：注意两种情况!可以是宽面向你,也可以是长面向你,所以谁是地面不一定.
如果都换成厘米,那么先求水的体积,30×20×5=3000（立方厘米）
除以新的底面 3000/（10×20）=15（厘米）
或者3000/(30*10)=10(厘米)
4.5040=2×2×2×2×3×3×5×7=7×8×9×10
他们的年龄各是7、8、9、10岁.

求面积：BOUNDARY生成PL线轮廓.AREA选OBJECT选中PL轮廓线.CAD2007直接标注弧长. 查看原帖

4、
平行四边形的周长=（60+30）x2=180米
46x5=230米
22x5=110米

BE=230-180-30=20米 CE=60-20=40米
CF=110-30-60=20米 DF=30-20=10米

连接AC
可以看出
△AEC的面积是△AEB面积的2倍
△AFC的面积是△AFD面积的2倍

所以,四边形AECF的面积是△AEB与△AFB面积的和的两倍

四边形AECF的面积是平行四边形ABCD的面积的2/3

5、
图形不完整

1)AAA型（动词原形、过去式、过去分词同形）
cost（花费） cost cost
cut（割） cut cut
hit（打） hit hit
hurt 伤害） hurt hurt
let（让） let let
put（放） put put
read （读） read read
(2) AAB型（动词原形与过去式同形）
beat（跳动） beat beaten
(3) ABA型（动词原形与过去分词同形）
become（变成） became become
come（来） came come
run（跑） ran run
(4) ABB型（过去式与过去分词同形）
dig（挖） dug dug get（得到） got got
hang（吊死） hanged hanged
hang（悬挂） hung hung
hold（抓住） held held shine（照耀） shone shone
sit（坐） sat sat win （赢） won won
meet（遇见） met met keep （保持） kept kept
sleep（睡） slept slept sweep（扫） swept swept
feel（感觉） felt felt smell（闻） smelt smelt
leave（离开） left left build（建设） built built
lend（借出） lent lent send （传送） sent sent
spend（花费） spent spent lose （丢失） lost lost
burn （燃烧） burnt burnt learn（学习） learnt learnt
mean（意思是） meant meant
catch（抓住） caught caught
teach（教） taught taught bring（带来） brought brought
fight （战斗） fought fought
buy（买） bought bought
think（想） thought thought
hear （听见） heard heard
sell（卖） sold sold tell（告诉） told told
say（说） said said find（找到） found found
have/has（有） had had
make（制造） made made
stand（站） stood stood understand明白 understood understood
(5) ABC型（动词原形、过去式与过去分词三者不同形）
begin（开始） began begun
drink（喝） drank drunk
ring（铃响） rang rung sing （唱） sang sung
swim（游泳） swam swum
blow（吹） blew blown
draw（画） drew drawn
fly（飞） flew flown
grow（生长） grew grown
know（知道） knew known
throw（投掷） threw thrown
show（出示） showed shown
break（打破） broke broken
choose（选择） chose chosen
forget（忘记） forgot forgotten (forgot)
speak（说,讲） spoke spoken
wake（醒） woke woke
drive（驾驶） drove driven
eat（吃） ate eaten fall（落下） fell fallen
give（给） gave given
rise（升高） rose risen
take（取） took taken mistake（弄错） mistook mistaken
ride（骑） rode ridden write（写） wrote written
do（做） did done
go（去） went gone
lie（平躺） lay lain see（看见） saw seen
wear（穿） wore worn
be ( am, is, are )（是） was, were been

是体积吧,因为石头全部浸入,水未溢出,所以v石=v水升=280*2=560

是360°
如果公式：（N-2）*180 N是指几边形
也可以逻辑思考 用三角形角交计算： 30°的两个外角+另外的两个内角=360

1.找一块木板或者其他材质的板子,厚度要均匀的,
2.按照地图形状锯出相同形状的木板,并测量出木板厚度h,
3.把木板放到烧杯或者其他能够测量体积的量器里面,测量其体积,得到体积V
5.木板面积=地图面积=体积/厚度 （V/h)