50道具有难度的四则混合计算题

使文章首尾呼应,结构完整.侧面描写,烘托出口技艺人艺术之高超,表演之精湛.与观众的反应,声音之多形成对比,衬托出技艺之精湛.

真实的砖瓦石块质量很大，会把人砸伤甚至砸死，而拍电影时不可能牺牲演员，要换用质量小、体积相同的假砖瓦石块作道具，所以选择密度小的泡沫塑料．
故选D．

设小华步行速度为x米/分钟,则自行车速度为3x米/分钟,
由题意,得
3000/x+2+3000/3x=42
4000/x=40
解得：x=100
所以小华步行速度为100米/分钟

很高兴为您答题,祝学习进步!有不明白的可以追问!
如果有其他需要帮助的题目,您可以求助我.望采纳,谢谢!

无聊,80分钟等于1小时20分钟嘛

首尾呼应,说明表演场地狭小,道具简单,侧面描写烘托出口技表演者高超的技艺.
采纳吧,我们老师都说过好几遍了.

解题思路：（1）设步行速度为x米/分，则自行车的速度为3x米/分，根据等量关系：骑自行车到学校比他从学校步行到家用时少20分钟可得出方程，解出即可；
（2）计算出步行、骑车及在家拿道具的时间和，然后与42比较即可作出判断．

（1）设步行速度为x米/分，则自行车的速度为3x米/分，
根据题意得：
2100
x=
2100
3x+20，
解得：x=70，
经检验x=70是原方程的解，
即李明步行的速度是70米/分．

（2）根据题意得，李明总共需要：
2100
70+
2100
3×70+1=41＜42．
即李明能在联欢会开始前赶到．
答：李明步行的速度为70米/分，能在联欢会开始前赶到学校．

点评：
本题考点： 分式方程的应用．

考点点评： 此题考查了分式方程的应用，设出步行的速度，根据等量关系得出方程是解答本题的关键，注意分式方程一定要检验．

主题
“秋之韵”诗歌朗诵会

时间
12月05日上午
形式
以小组为单位参加,4人为一个小组,共10个组
主持人
吴羽琦、郎晓迪
桌椅布置
第1、2小组成员
黑板美化
第3小组,可以到别的小组邀请画画能手
串联词撰写
第4、5小组,可以请老师指导
道具准备
第6小组,可以请电教老师协助
活动报道
第10小组,为学校红领巾广播站写一篇活动报道

水果店 ,顾客甲买了 2斤苹果和5斤橘子,共花了16元；顾客乙买了一斤苹果和一斤橘子,共花了 5元,问苹果和橘子的单价分别是多少元?

你铣六面体,使用的是什么铣刀?如果是使用端铣飞刀盘的话,就不在乎什么顺铣还是逆铣.铣六面体的顺序一般是一、二面,即铣对面；然后再铣三；四面,还是两对面；然后再铣五、六面.各对面一次铣到位,加工余量一边一半,不用留余量,如果要留磨量则另说.

圆的周长：18.84X2/3=12.56(分米）
圆的直径：12.56÷3.14=4（分米）
这个道具是半径是：4÷2=2（分米）

D

丙烯颜料吧
它干了很像塑料,防水性强,粘合性也不错.
如果是做道具 就建议使用这种颜料.
不过使用过程 注意不要弄到衣服,会洗不掉的

18 ANN’S BIRTHDAY
It was half past four.Everything was ready.All the food was on the table.The sandwiches were on the plates,and the candles were on the cake.Ann felt very happy.
“We are ready!” she said.“where is everyone?”
“That’s the doorbell,” said Ann’s mother.“They’re here!”
Ann ran to the door,and found Li Lei outside.
“Happy birthday!” he said,“Here’s your present.”
“Oh thank you!” said Ann.“Look at the beautiful paper.Can I open it now,or later?”
“There is no time!” laughed Mother.“Here are the twins.”
“Happy birthday!” said the twins,and gave her a big red box.
“What’s in the box?” Ann thought.Was it a sweater?
But there was no time to think.All her other friends were now outside the door.
“Happy birthday to you,Ann!” they said.
“Thank you,everyone.Please come in,” said Ann.
“Is everyone here?” asked Mother.
“No.Where is Jim?” asked Ann..
“I’m here!” said Jim.“Here is your birthday present.I hope you like it.”
Ann opened it.It was a CD.
“Wow!What a nice present!I like it very much!” said Ann with a big smile.
English dialogue
A:What does need help?
B:We wanted to go to Wenzhou,will also train today?
A:Sorry!No,today's tickets have been sold out of.
B:Oh,it is really bad.Does that tomorrow is the earliest departure time?
A:6:30 am
B:That too early,less?
A:Every 20 or 30 minutes,you want some points of departure?
B:This ah!Does it need to Wenzhou how long?Yes quick off?Fares?
A:Yes Express passengers.To Wenzhou about four and a half hours,the fare is 140 yuan
B:Well,we should about 8:00 am departure.
A:It's 8:00 can?
B:Yes
A:What should a few tickets?
B:3.Sorry!I physically uncomfortable,motion sickness!You can buy trouble 1:00 of the front seat?
A:TU,some.Will the children and hold hands with you to?
B:Of course!He also buying?
A:There is no need.Special to buy votes
B:special vote?What is special vote?
A:Traffic:a car can only carry 10% of the free children.So must purchase special votes.
B:That the trouble to help me buy.
A:Frankly!I have a good help for you.A total of 420 yuan,would have to increase insurance?
B:Yes,please add it.
A:The total of 426 yuan.
A:You at 450 yuan.This is your ticket,find 24 yuan to gain.
B:Okay,thank you!
A:Frankly,tomorrow free waiting room on the 12th gate on the train.
B:What troubles can buy back from Wenzhou return ticket?I fear that time is unable to buy tickets.
A:I am sorry.Return to buy votes here,you must go back to Hangzhou,Wenzhou purchase tickets
B:Oh,that!What if we can not catch up with the frequency of a frequency can be done?
A:Sorry!Not,can only do this frequency,it must refund late,and only half of a good retirement money,please do not late.
B:Yes,thank you for reminding
A:bluntly
B:BYE-BYE
A:BYE-BYE

在28米边平行的圆内,对折,找和28正好长短一样的地方对折一次,这样就找到了一条和21米垂直的直径了,把,21米的线,用直径和28米的宽度一直等分折叠看把21分成几份,这样就知道了直径到28米的距离了,再用21-那个距离就是半径!

解题思路：（1）要使拉力传感器示数始终为零，即细绳中的拉力为零，物体M应做自由落体运动，故梯子应以加速度g向上匀加速运动．根据牛顿第二定律求解．
（2）根据加速度关系，运用位移公式分析即可．

（1）据题有：m_梯g+mg=Mg，可得m_梯=M-m=90-60=30kg
设人与梯子之间的相互作用力为F，人向下的加速度为a．由题知细绳对滑轮的作用力为0，重物应处于完全失重，即下落加速度为g，梯子的加速度向上，大小为g，对梯子运用牛顿第二定律：
F-m_梯g=m_梯g
对人运用牛顿第二定律：
F+mg=ma
解得：a=[2M−m/m]g=[2×90−60/60]=2m/s²，方向向下．
（2）人从木梯一端爬到另一端时，设人的位移大小为x₁，木梯的位移大小为x₂．
则得：x₁=
1
2at2，x₂=
1
2gt2
又 x₁+x₂=L
解得 x₁=0.5m
答：
（1）人的加速度为2m/s²，方向向下；
（2）人从木梯一端爬到另一端时，人的位移是0.5m．

点评：
本题考点： 牛顿第二定律．

考点点评： 本题属于已知受力情况求解运动情况，知道加速度是力与运动联系起来的桥梁．

The Little Horse Crosses the River 小马过河
CHARACTERS IN THE PLAY:LITTLE HORSE,MOTHER HORSE,COW,SQUIRREL
剧中人物：小马,马妈妈,牛,松鼠
THE SCENE:By the river（河边）
[Enter the little horse and the mother horse with a bag]
Little horse:Mummy,I’m as tall as you.I grow up now.Let me carry the bag for you.
Mother horse:My dear.I’m glad you have grown big and can help me now.Take this bag of rice to your Uncle Pig,will you?Little horse:Yes.Mummy.Where dose Uncle Pig live?
Mother horse:He lives on the other side of the river.
Little horse:Mummy,I’ll get back soon.Bye-bye.Mother horse:Bye-bye.
[Exit] [Enter the cow] －－－－－ [hide=-1] Cow:Hi,Little Horse!Where are you going?
Little horse:Aunt Cow,I have to go to Uncle Pig’s house.Is there a bridge near here?
Cow:No,there is not any.If you want to go to his house,you have to cross the river.
Little horse:Is the river deep?And can I wade across?
Cow:No,it isn’t deep.I just came back from the other side,and the water only reaches my calf.
Little horse:Thanks,Aunt Cow.I’ll cross the river.
[Enter the little squirrel] Squirrel:Stop!Stop!The river is so deep that one of my fellows had been swept.
Little horse:It’s so lucky not to wade!
Cow:It isn’t deep.Little Horse,you can wade across the river.
Squirrel:It’s very deep.You can’t wade across the river.You will get drowned.
Little horse:But the water is deep or not?Shall I go on or shall I go back?I’d better go home and ask Mummy.
Cow and Squirrel:(together) Yes.You’d better ask your mummy.
[Enter the mother horse]-www.***.net
Little horse:Mummy,Mummy.Aunt Cow said that the river was not deep.I could wade across the river.But Brother Squirrel said that it was very deep.I couldn’t wade across the river.What should I do?
Mother horse:My child,both Aunt Cow and Brother Squirrel are right in their own way.Aunt Cow’s body is big,so she said the water was shallow.Brother Squirrel’s body is small,so he said the water was deep.You should think everything over by yourself.
Little horse:Oh,I see.I should try it myself.Little horse:(wades across the river) Mummy,in fact,it is not difficult to wide across the river.
Mother horse:My dear.No matter what happened,we should think it over and try it myself.Little horse:Yes,Mummy![/hide]
去101学习辅导答疑网看看,那里有专业的老师在线回答问题的!现在注册还免费送金豆!

我写过这个句子先采纳

方法：1 students stand or sit in a circle.让学生站或坐成一圈.
2 by the ball began to any student pass,the ball must say a number.由拿球的人开始向任意一个学生传球,球出手后说出一个数字.
3 ball students must tell the passer said digital one of the upper or lower a number.接球的同学必须说出传球者所说的的数字的上一个或下一个数字.
4 right to continue the game; wrong,penalty to sing an English song or rhyme.
Then began a new round of game.说对了继续游戏；说错了,罚唱一首英文歌或韵句.然后开始新一轮游戏.

解题思路：设小红步行的平均速度为x米/分，则骑自行车的平均速度为3x米/分．由小红骑自行车到学校比她从学校步行到家用时少20分钟为等量关系建立方程．

设小红步行的平均速度为x米/分，则骑自行车的平均速度为3x米/分，根据题意得：[2100/x]=[2100/3x]+20．
故答案是：[2100/x]=[2100/3x]+20．

点评：
本题考点： 分式方程的应用．

考点点评： 本题是一道行程问题的运用题考查了列分式方程解实际问题的运用，分式方程的解法的运用，解答时小红骑自行车到学校比她从学校步行到家用时少20分钟为等量关系建立方程是关键．

写出了道具的简单，突出了表演口技者技艺高超

点燃金属盒内的火药，火焰从盒内喷出，此时将化学能转化为内能；木棒连同金属盒由静止顺时针旋转起来，此过程将内能转化为机械能；而在汽油机的四冲程中，只有做功冲程将内能转化为机械能．A选项中，两个气阀关闭，火花塞点火，活塞向下运动，是做功冲程．
故选A．

“形影不离”所涉及的光学现象是影子，影子的形成原因是光在同一均匀介质中沿直线传播造成的；
故答案为：光在同种均匀介质中沿直线传播．

不可以。
分别列举道具的数量为一是为了突出道具的简单，为后文描写口技人技艺高超做铺垫。若改为桌椅抚尺各一则没有这种效果。

很简单!你拿住一个钉子!然后把其他的10个钉子交叉在你拿的那个钉子上!一边6个,记住是交叉!原理是钉子的帽卡在钉子上!两个一组!这样就不会掉下来了!

结构完整,道具前后呼应,衬托出口技人的技艺高超

设x人做花,50-x人做面具
18x=16×2（50-x）
解得x=32 即50-x=18
答：略

五公斤桶打满水倒入三公斤桶中,五公斤桶还剩两公斤水,三公斤桶倒空,将五公斤桶中的两公斤水倒入三公斤桶中,五公斤桶打满,将三公斤桶中倒满,也就是从五公斤桶中倒出一公斤,这时五公斤桶中还有四公斤水.

范进也是穿长衫的

最好用长方体箱子包装下,应该问题不大.

暗示了道具的简陋（简单）,衬托了口技人的技艺高超

水面浮针
你能把一根缝衣针放在水面上,让它像麦秆似的浮着吗?
很多人认为,这是不可能的,因为铁的比重比水的大,水的浮力不能托起铁针.
如果你也是这“很多人”中的一个,那么下面的实验可以使你改变看法.
取一碗水,拿一根细一点的缝衣针,稍微抹上一层猪油.在水面上放一小张能吸引的纸,再在纸面上轻轻地平放一枚缝衣针.等这张纸完全湿透以后,轻轻按下纸的四个角,使纸慢慢沉入水中.这时候,钢针却漂浮在水面上.放吸水纸的目的是为了减少针对水面的冲击.
水的表面有一层弹性的薄膜,是由于水的表面张力形成的.钢针如果不被沾湿或刺破这一层薄膜,这层薄膜就像一张绷紧的橡皮膜一样把钢针托住.在钢针上抹油就是为了不让水沾湿钢针,所以你在重复做这个实验以前,一定要把这枚纲针擦干,重新抹上一层油.
夏日,你在池塘里一定见过一些能在水面上爬来爬去的昆虫,叫做水黾虫（黾mǐn）.它不陷到水里的原因就是足上有一层油,身体又很轻,所以它在水面上就像在陆地上行走一样.
大哥,够好了吧!我还要用的呢!都给你了

求环形的面积,π×R²-π×r²=π（3²-2²）=15.7平方米
（转盘半径为4÷2=2米)
不懂就问,不要不好意思,但还是要多加思考,最后解决你自己问题的人只能是你

18=3*6
15=3*5
12=3*4
那么最大边长=3分米
体积=3*3*3=27立方分米
数量=6*5*4=120块

圆盘的半径为2,面积为12.56.圆盘加上保护垫的半径为3,面积为28.26.所以保护垫的面积为28.26-12.56=15.7.

试验1
名称：橡皮筋吉他
材料：几根粗细不同的橡皮筋,一个纸盒,两根木条
制作方法：把木条放在纸盒两侧,把粗细不同的橡皮筋有规律的捆在纸盒和木条上.
比较一下,是绷得较紧还是放松的橡皮筋音调高?是粗橡皮筋还是细橡皮筋的音调高?
你能否用实验结果解释：“为什么胡琴,提琴等弦乐器能发出不同音调的声音”
试验2：
可乐瓶一个,硬质塑料吸管一段
把可乐瓶盖上弄一个孔,刚好可以把吸管插入,使盖好盖子后下端尽量接近瓶底部,外面漏出一段就行,
密封吸管与瓶盖的结合部（我是用2秒胶粘的）
打开瓶盖灌入半瓶水,盖好盖拧紧了,向瓶内吹气,气泡聚集在瓶中水以上,使封闭的空气压强增大,嘴巴脱离吸管,会有水通过吸管从瓶中喷出
说明气压存在,这也是喷雾剂的原理

用短除法就可以了
3 | 18 15 12
——————
6 5 4
算出它们的公因数是3 ,就是（18/3）*（15/3）*（12/3）=6*5*4=120个
把短除法写在作业本上,然后直接用6*5*4=120个就可以了.
公因数：几个数公有的因数,叫做它们的公因数.

设他步行速度为v,则骑行速度为3v,可得（2.1/v）=（2.1/3v） 20,解得v=0.07km/min,然后易得步行花去时间30min,拿道具1min,骑行回学校10min,共41min

设步行速度为x米/分,则自行车的速度为3x米/分,
根据题意得：2100/x=2100/3x+20
解得：x=70
经检验x=70是原方程的解,
即李明步行的速度是70米/分．

我读大学的时候演过一个
就是几米的向左走向右走改过来的,你照着漫画的内容来做就可以
男女主角,圣诞老人,旁白,公园里面玩的一男一女,总共六个人,内容自己改编
我们设计的场景就是男女主角都梦见了圣诞老人,说要送个他们一个人生中最大的礼物,让他们到公园去,圣诞节那天他们都去了,看见了公园里面有一对谈恋爱的男女,引发了他们接下来的事情……
道具和布景都相当的简单

假设生产纪念币为X,生产纪念盒为Y,则：
4X+5Y=20000；得出：5Y=20000-4X,（A）
3X+10Y=30000；把上述A代入公式,则：
3X+2（20000-4X）=30000,解出X=2000个,再把X代入4X+5Y=20000,得出Y=2400
解得：
生产纪念币2000套,生产纪念章2400套.

设六位数2□1293为2a1293．
因为六位数2a1293是9的倍数，所以2+a+1+2+9+3=17+a是9的倍数．
经试算：a=1．即此六位数为211293．
故答案为：2112．

估计你把问题理解错了 肯定是让你回答用什么交通方式去means of transport

The trademark is used to distinguish different products or service mark. Global integration, rapid economic development, enterprise competitiveness depends largely on whether the enterprise succeeds in creating a good and cultural brand. Therefore, valuable trademarks of enterprises has become one of important assets. Trademark is a carrier of information, participate in market competition is the tool. Production operator's competition is the commodity or service quality and credibility of the competition, its manifestations is a trademark of well-known trademark competition, famous degree taller, goods or services to competition ability is stronger. Brand represents the trademark owner production or business reputation and image quality. Trademark logo except with landscaping, protection of product function and an important role, is to product advertising. As international trade and international marketing of transnational business operation of the increasingly frequent, the trademark translation as a means of communication and media plays a vital role in.
或
A trademark is a marker used to distinguish different products or services. Global integration, the rapid economic development, the strength of the competitiveness of enterprises depends largely on whether a company successfully created a wonderful cultural heritage of the brand. Therefore, a valuable trademark has become one of the important asset of the enterprise.The trademark is a carrier of product information, the tools to compete in the market. Competition in the production and operation of those goods or services, quality and credibility of the competition, its manifestations is the trademark of well-known competition, trademark visibility of the higher, the stronger competitiveness of the goods or services. The trademark represents the production of the trademark owner or operator of reputation for quality and corporate image. Trademark an important role in addition to with landscaping, protection products, is the product of advertising. With international trade and international marketing, international business operations have become increasingly frequent, the translation of the trademark as a means of communication and media plays a vital role.
都可以
希望采纳

长方体纸盒的长=宽=4厘米,高=6厘米
至少需要硬纸：4×4+4×4×6=16+96=112平方厘米

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设x人做花,50-x人做面具
18x=16×2（50-x）
解得x=32 即50-x=18

在青藏高原上,红柳随处可见,它们不要（ 温暖 ）的气候,不要土壤肥沃的（ 大地 ）,不要替它们整枝施肥的（花农 ）,只要有（ 一抔黄土 ）,就能深深扎根,顽强地生长.

周长=18.84✘2/3=12.56分米

一般可以通过行列式性质提出一个λ的一次因式
但这个不好想, 只能化化简, 撞大运
r1-(1/2)(λ-1)r2 - r3
0 -(1/2)(λ-1)(λ-2) -2(λ-2)
2 λ-2 2
0 2 λ-3
第1行可提出(λ-2)
余下的你应该会了