李东看一本书,第一天看了1/12还少5页第二天看了1/15还多3页,还剩206页这本故事

张华：（208+64）/2=136(分）
李东：208-136=72（分）
10x20=200分
20+2=22分
张华错了：（200-136）/22=?
核对一下题.

李东问,我应该排在哪一位同学的后面.

投资金额比,李东：王强=20:26=10:13
因此利润比,李东：王强=20:26=10:13
李东利润：9.2÷（10+13）×10=4万元
王强利润：9.2÷（10+13）×13=5.2万元

我们老师教的是比的方法做
按投资比例分配?
李东：王强=10：13
9.2÷（10+13）×10=李东的利润（4万）
9.2÷（10+13）×13=王强的利润（5.2万）

解题思路：每本3角，共买9本，共花：3×9=27角，因为李东要支付的钱数是奇数，售货员要找回的钱数是偶数，所以两者的和必须是奇数，即李东先给售货员的钱数必须是奇数，根据题意这个奇数还要是5的倍数，所以找出超过27的5的倍数，然后解答可．

3×9=27（角）
因为李东要支付的钱数是奇数，售货员要找回的钱数是偶数，
所以两者的和必须是奇数，即李东先给售货员的钱数必须是奇数，
又因为，根据题意这个奇数还要是5的倍数，所以先支付的钱数是超过27的5的倍数，
这个数，是35角，35÷5=7（张），这样付出7张5角的，找回：（35-27）÷2=4张2角的即可．
答：他至少应该给服务员7张5角币．

点评：
本题考点： 钱币问题．

考点点评： 本题关键是根据钱数的奇偶性确定先支付的钱数应既是超过27的5的倍数，又是奇数．

应该是“良药苦口利于病,忠言逆耳利于行.”

Is Liming two years younger than / junior to Lidong?
Is Liming younger than / junior to Lidong by two years
Is Liming Lidong's junior by two years?

（1）建议：下次在描述比较长的问题时,大意下载标题,下面还有个框些问题补充的,那里可以写很多子,不至于无法完整描述题目——我的经验.
（2）如果是选择题,那好办些,10分钟——张平1/2,李东完成2/3,超过一篇文章.
5分钟——张平1/4,李东1/3,未达到一篇文章,所以,时间为5~10分钟的那个选项.
（3）填空的话,李东：完成要15分钟；
设文章总字数数X,两人合作用时间：t,则两人速度为,张平X/20（字/分）；李东X/15（字/分）
就会有这个方程：（X/20X/15）*t=X
就会解出所用时间t=8.5 即需要9分钟.
以上,仅供参考
勇敢建议更优算法!

Dear Wang Ming,
How is everything going?
We miss you so much since you transferred to ShenZhen with your parents. There is a new children's palace in Hui Lai. It is very good and attractive. Our school has empolyed a new foreign teacher ,Most of us are fond of learning English and Ihave got a great improvement on it.
Have you been used to living in ShenZhen? If you have any problem,you should ask your friends to help you or send e-mail to us. We will try our best to help you .Besides, you should get into the new life as soon as possible. Make new friends and learn new local customs.Hope to see you againg.
yours,
Li Dong

奖品应归四人共同占有。因为：以公平为基础的合作才是良好的合作，获得冠军仅凭一个人的力量是不够的，必须靠四人的共同努力。所以，奖品应归四人共同占有。

解题思路：（1）近视眼镜是凹透镜，从镜子前面观察，其外面呈弧形，类似于凸面镜；
（2）外面的物体经凸面镜成像，成的是正立的虚像，像的大小与物体到镜面的距离有关．

近视镜从前面观察，会由于光的反射成像，镜片是有弧度的，从前面看向外凸，与凸面镜成像是一样的，成的是虚像，离镜片越近，所成的像越大．
故答案为：虚；凸；近．

点评：
本题考点： 近视眼的成因与矫正办法；凸面镜和凹面镜．

考点点评： 本题考查凸面镜的成像特点，解题的关键是对凸面镜成像的特点有所了解．

答案： （8*20-100）/（8+4） 　　=60/12 　　=5（道） 　　20-5=15（道） 　　答：他作对了15道题 希望对你有帮助，祝学习进步！

The following is our guide Li Dong out of the"underachievers" ranks,entered the ranks of "eugenics"experience.
Previous problems
1 Learning:learning objective is not clear,the lack ofinterest and curiosity,often unable to focus lectures,homework not completed seriously,poor academic performance.
2 thoughts:the thinking of weird,inferiority and self-esteem,lack of initiative,follow one's own inclination,fun,infatuated with the game.
3 personality:stubborn,stubborn,but there aredependency and inertia psychology.Work,get along withpeople reckless,lack of self-control,lack of sense of responsibility.
The 4 discipline:free lax,lazy quirks,daily behavior habits.
5 life:life self-care,independent ability is bad.
6 things:work emotional,impulsive.Failing to calm,reverse psychology,vanity strong.
After a semester of specific education and transformation work,Li Dong gradually correct the attitude,all changeobviously.Daily behavior better,no longer obsessed withcomputer games,and students get along more harmonious,can take the initiative to participate in a variety of usefulgroup activities; and take the initiative to communicate with their parents,straighten out the relationship between the.The teachers respect,with a clear understanding of thepurpose of study,can insist on full well the course,performance gradually improved.His life is full of confidence,the mood is stable,impulse events graduallyreduced,had the preliminary understanding to the labor ofduty,active,enthusiastic and hard-working,mistakes can recognize the error where.
Headstrong,stubborn to ease,work can have a purpose,reverse psychology in weakening.The study and life of the good psychological condition,confidence in the learning process very best.He has been from the "underachievers" ranks of coming out,is striding toward "eugenics" queue.

解题思路：根据数量=总价÷单价，先分别求出一小时以后，两人停车的时间，再加上1小时，就是他们各自停车的时间．据此解答．

李东停车的时间是：
（14-4）÷2+1，
=10÷2+1，
=5+1，
=6（小时），
张丽停车的时间是：
（14-5）÷3+1，
=9÷3+1，
=3+1，
=4（小时）；
答：李东停车6小时，张丽停车4小时．

点评：
本题考点： 整数、小数复合应用题．

考点点评： 本题的关键是根据数量=总价÷单价，先求出第一小时后，停车的时间．

李x,王y
(y-30)*2=x
x-30=3y

根据电能表上标的参数“2400R/kwh”的含义可知，每消耗1kW•h的电能，电能表的转盘转2400转，
当电能表上转盘转600转时，用电器消耗的电能W=
1
2400 kW•h×600=0.25kW•h；
消耗的电能时，表盘转了0.4kW•h×2400R/kw•h=960R．
故答案是：2400；0.25kW•h；960．

Dear Jim
Now let me tell you about my school life.
There are for lessons in the morning .The first lesson starts at 8:00 a.m..I have lunch at 12:00 every day.And there are 2 lessons in the afternoon.
After classes,I play football or play the piano.They are fun~
My favourite lessons are English and Music,because they are interesting.I don't like Maths.It is so difficult,but I think I must work hard.
This is my school life.I love it.

66

The following is our guide Li Dong out of the"underachievers" ranks, entered the ranks of "eugenics"experience.
Previous problems
1 Learning: learning objective is not clear, the lack ofinterest and curiosity, often unable to focus lectures,homework not completed seriously, poor academic performance.
2 thoughts: the thinking of weird, inferiority and self-esteem,lack of initiative, follow one's own inclination, fun, infatuated with the game.
3 personality: stubborn, stubborn, but there aredependency and inertia psychology. Work, get along withpeople reckless, lack of self-control, lack of sense of responsibility.
The 4 discipline: free lax, lazy quirks, daily behavior habits.
5 life: life self-care, independent ability is bad.
6 things: work emotional, impulsive. Failing to calm, reverse psychology, vanity strong.
After a semester of specific education and transformation work, Li Dong gradually correct the attitude, all changeobviously. Daily behavior better, no longer obsessed withcomputer games, and students get along more harmonious,can take the initiative to participate in a variety of usefulgroup activities; and take the initiative to communicate with their parents, straighten out the relationship between the.The teachers respect, with a clear understanding of thepurpose of study, can insist on full well the course,performance gradually improved. His life is full of confidence, the mood is stable, impulse events graduallyreduced, had the preliminary understanding to the labor ofduty, active, enthusiastic and hard-working, mistakes can recognize the error where.
Headstrong, stubborn to ease, work can have a purpose,reverse psychology in weakening. The study and life of the good psychological condition, confidence in the learning process very best. He has been from the "underachievers" ranks of coming out, is striding toward "eugenics" queue.

解题思路：第一周读了这本书的[3/7]，把这本书的总页数看作单位“1”，据乘法意义求出第一周读的页数，二周读的页数是第一周的[3/4]，把第一周读的页数看作单位“1”，据乘法意义解答．

196×[3/7]×[3/4]，
=63（页）．
答：第二周读了96页．

点评：
本题考点： 分数四则复合应用题．

考点点评： 此题考查分数乘法应用题，解决此题的关键是两个单位“1”的不同．

解题思路：能表表盘上标的“2400R/kwh”表示的含义是：每消耗1kW•h的电能，电能表的转盘转2400转．根据这个参数，如果电能表表盘实际转动的圈数为n，则可以求出用电器消耗的电能，

根据电能表上标的参数“2400R/kwh”的含义可知，每消耗1kW•h的电能，电能表的转盘转2400转，
当电能表上转盘转600转时，用电器消耗的电能W=[1/2400]kW•h×600=0.25kW•h；
消耗的电能时，表盘转了0.4kW•h×2400R/kw•h=960R．
故答案是：2400；0.25kW•h；960．

点评：
本题考点： 电能表参数的理解与电能的求法．

考点点评： 该题考查了电能表上有关参数的意义，以及根据参数求用电器实际消耗电能的计算，系基本知识与技能的考查，关键是理解参数的物理意义．

这篇文章的作者难道不是李东吗？ 或者改成 这篇文章难道不是李东写的吗

Dear Guo Wei,
I am very happy to know from your e-mail that
you are going to take part in English speech contest of the school representing your class, it's amazing! As you have also told me that you were shy and would be terrified of speaking in front of so many people, but you did not want to let your classmates down, I understand you, since you have rare chance to speek in public, it would be quite difficult for you to conquer such, but I think your oral English is quite good, I believe othe people will be impressed if you speak in the contest, the only thing you need is confidence, you should be confident, just regard the contest as a snap, and try your best to win, that will be OK!
I look forward to hearing good new from you!
Yours,
Li Dong

答案：B、D.图中1为肱二头肌,2为肱三头肌.投掷铅球使用的是手臂推送的力量,那么应该是肱三头肌发力为主,肱二头肌辅以舒张,在神经系统的支配下共同的来完成这个动作.

Dear ladies and gentlemen:
I'm glad to accept CCTV middle school students English speech contest winners Qingdao English camp invitation, I will attend the expensive television on July 20-27 have activities of the organization. I really enjoyed the "teach foreigners learn Chinese" activities, because this can make us direct exchange learning from each other. Of course, if can will among them "watch English movies" activities also changed directly exchange activities, the kind you'd better .
Thank you very much.
Yours truly,
Li Dong 要采纳我的啊

C

C

只能确定他站在第5列上

Is Li Dong your friend?

这是数学题.
1.倒出第一次再加满 就剩下a-10毫升 体积分数为(a-10)/a
所以第二次倒出的20毫升中 有20*(a-10)/a毫升纯酒精.
2.第二次倒出的时候,原来的瓶中的纯酒精有 a-10-20*(a-10)/a
所以浓度是(a-10-20*(a-10)/a)/a

解题思路：根据年龄差不会随时间的变化而改变，所以张强与李东今年的年龄差就是c年后张强与李东的年龄差．

a-（a-7），
=7（岁），
答：再过c年，他们的年龄相差是7岁；
故选：A．

点评：
本题考点： 用字母表示数．

考点点评： 解答此题的关键是：明确年龄差不会随时间的变化而改变．

解题思路：（1）近视眼镜是凹透镜，从镜子前面观察，其外面呈弧形，类似于凸面镜；
（2）外面的物体经凸面镜成像，成的是正立的虚像，像的大小与物体到镜面的距离有关．

近视镜从前面观察，会由于光的反射成像，镜片是有弧度的，从前面看向外凸，与凸面镜成像是一样的，成的是虚像，离镜片越近，所成的像越大．
故答案为：虚；凸；近．

点评：
本题考点： 近视眼的成因与矫正办法；凸面镜和凹面镜．

考点点评： 本题考查凸面镜的成像特点，解题的关键是对凸面镜成像的特点有所了解．

180减(15乘4 18乘4)等于48 48除4等于12 高是12

1. 设行完全程还要X小时,则：
1/(X+4) = 6/7 / 4
解方程得：X=2/3 (小时）
2. 设这本故事书有X页,则：
X/12 - 5 + X/15 + 3 + 206 = X
解方程得：X=240 （页）
3. 设两管齐开,X小时可将空池放满,则：
1/10 + 1/15 = 1/ X
解方程得：X=6 (小时)

共有
48÷（1－1/3）＝72（千克）
卖出
72×1/3＝24（千克）

1、李东利润：20/（20+30）*9.5=3.8万元,王强：30/（20+30）*9.5=5.7万元
2、平均数是70,和即是140,甲占2/（2+5）=2/7,所以甲数是140*2/7=40
3、周长是50,则长加宽是25,长占长加宽的3/（3+2）=3/5,所以长是25*3/5=15,所以宽是10,面积是15*10=150.
4、巧克力应用60÷5*3=36,剩60-36=24,或者另一个思路：两个都是60克,巧克力占比少2/5,所以用60*2/5=24.
5、顶角和一个底角的度数比是4：3,则三个角的比是4：3：3,三个角的和180度,那么顶角度数是4/（4+3+3）*180=72,底角是3/（4+3+3）*180=54.
6、（1）1000*1/25=40.（2）520*1/（1+25）=20
7、棱长总和是96厘米,它的长宽高之间比是3：2：1,长是96*3/（3+2+1）=48,宽是96*2/（3+2+1）=32,高是96*1/（3+2+1）=16.体积是48*32*16=24576
8、昨天借出它的6分之1,今天借出25本,这时借出的书与剩下的本数比是7：5,借出的书一共占总数7/（7+5）=7/12,昨天是1/6,今天则是7/12-1/6=5/12,即25本占总数的5/12,所以总数是25÷5/12=60本.
如有问题请留言,望采纳.

设有x张5元.
5x-2x=9
3x=9
x=3
有3张五元.因为五元和两元的张数相同 所以有3张2元3张5元

X*2/3=48 X=72 72*1/3=24 卖掉24千克

还剩14元.因为张明,王方,李东三人的钱数比为:5/3:4/3:3/2即10:8:9
54/（10+8+9）=2
张明,王方,李东三人的钱分别为：20,16,18
20*（1-3/5）+18*（1-2/3）=14

设答对了x题
5x-2（20-x）=79
x=17
答：他做对了17道

由题可知,客厅的面积是6*4=24平方米=240000平方厘米
边长为50厘米的正方形面积是2500平方厘米
可知240000∕2500=96块

1.要分成大小相同的正方形,则要求在长方形长和宽中取最大公约数
32和24的最大公约数是8
小正方形的边长为8米
2.长32米可分为4个8米
宽24米可分为3个8米
4x3=12
可以分为12个小正方形

算术方法：(188-4）/2=92分 92+4=96分
答：王刚考了92分,李东考了96分
方程方法：设王刚考了x分,那么李东考了x+4分
则有：x+(x+4)=188分
2x=184
x=92
答：王刚考了92分,李东考了96分

李东在村子边遇到李强,便约李强周末一起去公园

每个选项可以设置,如果你这么推论,ABCD.影响学生的政策问题,开创自己的事业,没有足够的企业.D是说是西方的学生喜欢挑战不敢.每一个选项都有一定道理的.
但最终只能选择一个选项,选项,选择必然性的质疑.的政策是不推不肯定不低,B项基数大的推动,而不是实际的一些小D样的挑战,也将推动企业肯定不会到低.只有C项是西方大学的学生的成功率很低,没有真正能够证明,这是必要的.
以上回答你满意么?

设2元、10元的纸币各有x张,则5元的纸币有80-2x张,
2x+10x+(80-2x)*5=450
2x=50
x=25
所以,2元和10元的纸币各有25张,5元的纸币有80-25-25=30张.

先求两人的平均分,分别为93.6和92.6
再求方差：可看出王明的成绩较为稳定,而且平均分较高.应该派王明去

DearI Harry：
Thank you for your letter 。In our China has many customs 。For example ，In before knocking at the door, the door is opened, in the master said, "come in" only after in the door. After...