3分钟语文演讲 多少字

盈亏问题.
都按原定时间计算
每分钟80米,早到6分钟,能多行：80×6=480米
每分钟50米,迟到3分钟,少行：50×3=150米
原定时间：（480+150）÷（80-50）=21分钟
学校到家的距离：50×（21+3）=1200米

Jack:“hey，tom。are you at home?”
Tom:"yes ,I am .what up?"
Jack:"I am right at your door."
Tom open the door .
"Hey!"
Jack:"that is lucy/ that is tom "
lucy:"hello,tom"
tom:"hello ,lucy .comeing!"

21是3的7倍,有152乘7等于1064米,1064大于1000.能走完

三分钟

globalization,the new reality
Globalization is a murky term.It can refer to everything
from the interconnectedness of experience
to the rise in international ventures.For the design and
construction industry,however,globalization is a trend
that means two things:increased opportunity and increased
competition.
Some may assert that globalization is a phenomenon
taking place in the nebulous “over there” and that it affects
only the largest international players,the Bechtels
and the Kellogg Brown & Roots.Yet many domestic
firms content with operating within U.S.borders must
still contend with global forces.Anyone who thinks that
globalization is far removed from our shores should
think again.
The reality is that globalization already affects designers
and contractors in Middle America almost as much as
it does the industry’s biggest players.As foreign firms
underbid for domestic construction work and purchase
domestic companies—and as domestic companies subcontract
work overseas—global forces can affect almost
any design or construction firm.What globalization
means for the domestic designer or contractor depends
on several factors.Very few industry sectors,in fact,are
immune to globalization.The largest U.S.contractors
must compete with the world’s largest,among them London’s
AMEC and the Dutch firm Nethconsult,while
medium-sized contractors must constantly take advantage
of opportunities and continue to manage change effectively.
Even small firms will find challenges in retaining
loyal customers that find they can contract similar
services for less money.
Size and location are important but are definitely not
the only variables.Specialty services,market position,
corporate culture,and a willingness to accept and manage
change will all have a bearing on a company’s ability
to compete in the globalized future.Moreover,the global
production of engineers has surpassed 1 million per year.
While the United States remains a world leader in civil
engineering education,many other nations can offer
technically proficient personnel at a fraction of the U.S.cost.Electronic global communication,virtual plans,and
free-trade initiatives will intensify the reach and scope of
global competition.In the 21st century,it will only become
easier to subcontract certain design functions to
less-costly overseas firms,commonly referred to as design
centers.
Aside from competition,globalization also presents opportunity.
No one denies that the current U.S.economic
boom has been good for the design and construction industry.
While some sectors,such as retrofitting,have
lagged,most have been healthy.We think that,as with
all good things,this boom too must come to an end.Or
must it?When the U.S.economy slows,design and construction
firms looking globally can continue to reap profits.
Firms based in the United States can perform work in
other countries,form joint ventures,or even offer consulting
advice on techniques and project management.
Design firms looking to streamline can also consider setting
up international branches to take advantage of lower
labor costs.
Despite these attractive opportunities,no design or
contracting firm should jump into the sea of international
markets headfirst.There are inherent challenges and difficulties
associated with any international endeavor,and
each project abroad will come with a multitude of peculiarities.
While certain sectors of the world remain
volatile and daunting,others,such as Europe,Canada,
and Mexico,remain stable.
Engineers must embrace globalization as the new reality
or risk losing their place in the economy of the future.
There are others out there willing to do the work if we
aren’t.Accordingly,this issue of J M E is dedicated to
globalization.It is a trend that our industry cannot afford
to ignore.

解题思路：早晨8点按标准时间把闹钟拨准了，到这个钟指向中午12点时，时钟共走了4个小时，因闹钟每小时慢3分钟，时钟1小时，实际走了（60-3）=57分钟，据此解答即可．

设时钟实际走了x小时
57：60=（12-8）：x
x=60×4÷57
x=4[4/19]
故答案为：12时12[12/19]分．

点评：
本题考点： 时间与钟面．

考点点评： 本题的关键是根据标准时间与闹钟走的时间的比一定，来列方程解答．

(1)小虫爬行的路程为4*3=12个单位长度
小虫爬的路程为12个单位长度
(2)小虫爬了个往返且速度没变
所以单程时间为3/2=1.5分钟
所以单程长度为4*1.5=6个单位长度
因为题中没有告诉B点在A点左侧还是右侧
所以B点就有2种可能
①B在A左侧,所以B点为-1-6=-7
②B在A右侧,所以B点为-1+6=5

早上5点对准标准时间后,到第二天早上标准时间5时的时候 ：即共24个小时
那么共慢走了24*3=72分=1小时12分
实际时间3:48分

15/5X3X2＝l8

李：3÷2 = 3 2路：6/5肖5/3的雨很快

3分钟.

3-1=2（次）（三段要聚两次））2*3=6（次）（三根要举六次)3*6=18(分钟）

甲完成：1410/（1+3/4+3/5）＝600个
乙完成：600*3/4＝450个
丙完成：600*3/5＝360个

问的是一共需要,所以应该是5＋4＋3＝12分钟.

24分钟哟 锯成九段要锯八下

每分钟行0.4千米快!

These things can never die这些美好不会消逝
--Charles Dickens/查尔斯.狄更斯
The pure.the bright,the beautiful, 一切纯洁的,辉煌的,美丽的,
That stirred our hearts in youth, 强烈地震撼着我们年轻的心灵的,
The impulses to wor...

解题思路：3000R/kW•h所表示的物理意义：电路中每消耗1kW•h的电能，电能表的转盘转3000R．据此可求当电能表的转数为15转时消耗的电能，又知道工作时间，根据公式P=[W/t]求出电功率．

3000R/kW•h所表示的物理意义为：表示每消耗1kW•h的电能，电能表的转盘转3000R．
电能表的转盘转15R消耗的电能为：W=[15R/3000R/kW•h]=0.005kW•h=18000J，
而t=3min=180s，
∴该灯泡的电功率为：P=[W/t]=[18000J/180s]=100W．
故答案为：0.005；100．

点评：
本题考点： 电功率的计算；电能表参数的理解与电能的求法．

考点点评： 本题考查消耗电能、电功率的计算，关键是公式及其变形的灵活运用；难点是对电能表各个参数物理意义的正确理解；解题过程中要注意单位的换算．

76x9÷（9-3）=76x9÷6=114米
以114米每分钟走就可以了
如追加其它问题,采纳本题后点击想我求助,

(Sam and Tom are talking about the difference between Collage and university)Tom:hi Sam,how are you?Sam:good thanksTom:so,is every thing fine at your university?Sam:pretty good.Just feel a bit weird.Tom:same here,I feel weird too about going to university everyday without any having any interest about it.Sam:it’s like you feel like you’re rejected,nothing feels unfamiliar to you,and sometimes you gets really scared of a teacher.It’s nothing like collage at all!Tom:I agree,even some of my classmates were scared too,because all teachers look much severed.Sam:in collage,at least the teachers aren’t that scary and strict.Homework are not so hard.In university,homework are increasing so fast that you can’t get a breath out of it!Tom:next week,I’m having a test,and they said it’s going to be so hard!Sam:me too,not next week,but soon.In collage,we don’t get much trouble if we don’t get a high mark,but in university,you just have to go for it,try as hard as you can to graduate at the end.Tom:yes,I think I better go back home to study now,see ya!Sam:ok,see ya!

3分钟很短的,讲个小故事吧.
Advice From Dad
A young boy and his dad went out fishing one fine morning. After a few quiet hours out in the boat, the boy became curious about the world around him. He looked up at his dad and asked "How do fish breath under water?"
His dad thought about it for a moment, then replied, "I really don't know, son."
The boy sat quietly from another moment, then turned back to his dad and asked, "How does our boat float on the water?"
Once again his dad replied, "Don’t know, son."
Pondering his thoughts again, a short while later, the boy asks "Why is the sky blue?"
Again, his dad replied. "Don’t know, son."
The inquisitive boy, worried he was annoying his father, asks this time "Dad, do you mind that I'm asking you all of these questions?"
"Of course not son." replied his dad, "How else are you ever going to learn anything?"

要把木头锯四段只要三次就可以了,所以需要时间为3*3=9分钟,30-9=21,所以最晚在16：21分开始锯

4.8

解题思路：（1）由表中信息可知，电热水壶的额定功率是1000W，应用W=Pt可以求出3min电热水壶消耗的电能．
（2）由密度公式的变形公式求出水的质量，然后由热量公式求出水吸收的热量．
（3）根据（1）（2）的计算结果分析答题．

（1）电热水壶的额定功率P=1000W，
电热水壶正常工作t=3min=180s消耗的电能：
W=Pt=1000W×180s=1.8×10⁵J；
（2）∵ρ=[m/V]，
∴水的质量：
m=ρV=1×10³kg/m³×2×10^-3m³=2kg，
在一标准大气压下水的沸点为100℃，
把水烧开，水吸收的热量：
Q=cm△t=4.2×10³J/（kg•℃）×2kg×（100℃-30℃）=5.88×10⁵J；
（3）由（1）（2）的计算可知，电热水壶3min内消耗的电能小于把水烧开需要的热量，
在3min内，该电水壶不能把水烧开，广告是虚假的，不可信；
答：（1）电热水壶正常工作3分钟消耗1.8×10⁵J的电能；
（2）水烧开需要吸收5.88×10⁵J的热量；
（3）3分钟不能将一壶水烧开，上述广告不可信．

点评：
本题考点： 电功与热量的综合计算．

考点点评： 本题考查了求电热水壶消耗的电能、水吸收的热量等问题，应用功率的变形公式与热量公式即可正确解题，本题难度不大．

解题思路：用小刚3分钟行驶的路程除以3分钟，求出小刚每分钟行驶的路程，然后再与小明每分钟行驶的路程比较即可．

1÷3=[1/3]（千米）=0.
•
3（千米）；
0.4＞
•
3；
答：小明的速度快一些．

点评：
本题考点： 简单的行程问题．

考点点评： 本题只要根据速度=路程÷时间，求出小刚的速度，再与小明的速度比较即可求解．

三只小猪是兄弟,为抵抗大野狼而有不同的遭遇,大哥盖草屋,二哥盖木屋,三弟盖了砖屋,最后只有不嫌麻烦的三弟的屋子没有被大野狼弄垮,还把大野狼给煮来吃了.
目前较为流传的版本因针对儿童心理而修改过,将狼吃猪,猪吃狼的情节修改掉,变成三弟最后保护了大哥和二哥,并用巧计赶走大野狼.
在英语世界中,三只小猪的童话其实也是童谣.其中大野狼的台词因押韵有趣而相当著名.
Mother Pig sends her three little piglets out into the world to live on their own.
The first little pig builds a house of straw,but a wolf blows it down and eats the pig.The encounter between wolf and pig features ringing proverbial phrases:
One day the big bad wolf came and knocked on the first little pig's door and said,"Little pig,little pig,let me come in." And the little pig answered,"No,no,I won't let you come in,not by the hair on my chinny chin chin." "Well," said the wolf,"then I'll huff and I'll puff and I'll blow your house in." So he huffed and he puffed and he blew the house down and ate the little pig.
The second pig builds a house of sticks,has the same conversation with the wolf,and meets the same fate.
The third pig builds a house of brick.The wolf cannot huff and puff hard enough to blow the house down.He attempts to trick the third little pig out of his house,but the pig outsmarts him at every turn.Finally,the wolf threatens to come down the chimney,whereupon the third little pig boils a pot of water into which the wolf plunges.The little pig cooks the wolf and eats him.

什么意思

刘师傅.
60分钟刘可以200个,张做195个,李师傅192个

等候时间的总和最少,即从最少时间那个同学先批改,一共用时：1*3+2*2+3*1=10分钟
等候时间的总和最多,即从用时最多那个同学先批发：一共用时：3*3+2*2+1*1=14分钟

9+27÷60-(3÷60÷9)x=9+41÷60+(5÷60÷6)x
(5÷360)x+(3÷420)x=9+41÷60-9-27÷60
1/72x+1/140x=14/60
35x/2520+18x/2520=7/30
53x=17640/30
53x=588
x≈11.09
∴那么至少要经过（11.09）小时,手表和闹钟才能指示同一时刻.

解题思路：先利用圆的周长公式求出汽车外胎的周长，再求车轮每分钟行驶的距离，然后利用“路程=速度×时间”即可求出这座桥的长度．

80厘米=0.8米
车轮的速度：3.14×0.8×200
=3.14×160
=502.4（米）
大桥的长度：502.4×3=1507.2（米）．
答：这座桥全长1507.2米．

点评：
本题考点： 有关圆的应用题．

考点点评： 此题主要考查圆的周长的计算方法以及行程问题中的基本数量关系：路程=速度×时间．

小明：20÷5＝4道/分
小红：15÷3＝5道/分
小兵：35÷8＝4道------3道
小红快!

回答：
顺序是：d-b-c-a
2*4+3*3+4*2+5=8+9+8+5=30（分钟）这个时间是30分钟
亲爱滴楼主望给个采纳
please
酱油来也

15分钟

900除已12等于75

(15-3-10)/15=2/15

看小学数学去

the post office is next to the Bank of China

每执行一次x=x&(x-1),就相当于把x二进制数从右向左第一个非零数变为零.
所以循环的次数也就是x的二进制数中的非零位数.
9999对应的二进制数是10011100001111,有8个1（不为0）所以循环8次,返回8

9/3=3 平均每分钟做3个零件
3/9=1/3 平均做一个零件要用1/3分钟

根据速度
甲1/5+2/5+x/5
乙2/4+x/4
丙x/3
时间是x+3
只要甲乙丙同时为整时,他们在A相遇
试一下可得x=42
所以要45分钟后

13分钟

效率之比5:3
各做500 300

小明的速度v1=400/3
小华的速度v2=400/4
400=(v1-v2)*t
t=12（分钟）

解题思路：快车比慢车在A地晚出发10分钟，早6分钟到达B地，慢车在中点停了3分钟，快车比慢车少走：10+6-3=13（分钟），快车速度是慢车速度的1.5倍，时间是慢车的1÷1.5=[2/3]，慢车用时：13÷（1-[2/3]）=39（分），快车用时：39×[2/3]=26（分钟），快车每分钟行全程的[1/26]，慢车[1/39]，然后分两种情况讨论追及的时间：超过中点和不超过中点，根据相遇时行驶的时间相同可以列出方程即可求出追上的时间．

快车比慢车少走：10+6-3=13（分钟），
时间是慢车的：1÷1.5=[2/3]，
慢车用时：13÷（1-[2/3]）=39（分），
快车用时：39×[2/3]=26（分钟），
快车每分钟行全程的：[1/26]，慢车每分钟行全程的：[1/39]，
设慢车出发t分钟后，快车超过．
当未过中点时，即t＜[39/2]分钟，[t−10/26]=[t/39]，得t=30＞[39/2]，不合题意，
当过中点，即t＞[39/2]分钟，[t−3/39]=[t−10/26]，解得t=24，
所以，快车超过慢车是6点24分；
答：快车超过慢车时是6点24分．

点评：
本题考点： 发车间隔问题．

考点点评： 本题关键是求出快车和慢车都从A地到B地的行驶时间，再根据两种情况讨论追及的时间．

假设亮每秒钟走1级楼梯
那么扶梯长90级
扶梯动的速度是90÷180=0.5级/秒
都动的情况,90÷（1+0.5）=60秒=1分
1分钟即可上楼.
或者这样想：
亮走的速度是扶梯速度的2倍
因此和速度是扶梯速度的3倍
扶梯3分,3倍的速度就只需要1分

设小英应该x分钟到校
60（x+5）=80（x-3）
x=27
则学校离家距离为60（27+5）=1920

5+2=7 8个7分钟为56.还余4分钟. 总共需要走5X8+4=44分钟 就是说一直走需要44分钟.
5个8分钟为40分钟. 那就是5X(8+3)+4=59 分钟.

打6分钟后还剩=410-43×6=152个字没打完
再打3分钟=43×（6+3）=387个字,小于410字,所以,不能打完这篇作文.