张磊的故事书本数是李新的六倍,如果两人各在买两本,那么张磊的本数是李新的四倍.两人原来各有故事书多少本?要算式.

如果李新买2本,张磊买2×6=12本那么张磊的书还是李新的6倍现在张磊少买了12-2=10本是李新的4倍所以李新现在有10/(6-4)=5本原来,李新有5-2=3本张磊有3×6=18本 方程:假设李新在买书之前有X本书,因为张磊的故事书本数...

解题思路：要想分析R₁两端的电压U₁与电源两端的电压U的关系，应分析出电阻R₂两端的电压U₂是多少，再从串联电路电压规律的角度，表示出二者的关系．

从表格数据中可以看出U₁+2V=U，这就是电源电压，根据串联电路的分压关系可知R₁两端的电压U₁与电源两端的电压U的关系为：U=U₁+2V．
故答案为：串联电路中，U₂为2V时，U=U₁+2V．

点评：
本题考点： 探究串、并联电路中的电压规律实验．

考点点评： 电路中的两个电压值都在发生变化，其真正的原因是它们的和要始终等于电源电压，因此，发现了这一点，就不难用电源电压表示出二者之间的关系了．

解题思路：（1）带电的物体能够吸引轻小的物体；
（2）摩擦现象生活中很常见，晚上睡觉前脱衣服时有火花；衣服上易沾有灰尘；梳子梳头发，头发随梳子飘起来等．

电风扇转动时，扇叶与空气摩擦使风扇叶上带了电，从而吸引一些灰尘；
故答案为：摩擦起电（带电体吸引轻小物体）．

点评：
本题考点： 摩擦起电．

考点点评： 对生活中的一些摩擦起电现象要了解，并会分析摩擦起电现象．

方法一利息：3000*2*2.79%=167.4
方法二利息：3000*（1+2.25%）*（1+2.25%）-3000 = 136.52元
还是存两年期的比较合算.

解题思路：已知开始写作业时刻下午5时25分和完成作业所用时间40分，求完成作业的时刻，用开始写作业时刻加上完成作业所用时间，即可得解．

下午5时25分+40分=下午6时5分
答：他是下午6时5分完成作业的．

点评：
本题考点： 日期和时间的推算

考点点评： 本题考查了时间的推算，完成作业时刻=开始写作业时刻+完成作业所用时间．

对不起,王老师,我双休日因为生病去医院输液,所以没有完成作业.我会补上的,请老师原谅我.

Dear Zhang Lei,
I’m glad to receive your letter. You told me that you are having trouble in life in senior school. So I decide to write to you in order to offer my guidance on your learning and living problems.
In your letter, you have mentioned that you have too much homework to do and it is too difficult for you. In my opinion, you may turn to your teachers and make some changes in your learning style. That way, you can not only get along well with your teachers, but also play an important role in your own study.
In terms of friendship, you said you have suffered from loneliness because you have few friends. I think it is very normal when you just have spent three months in your new school and new class. It would be a good idea if you join in some school activities actively and try your best to make more friends. By doing this, you will find there are many lovely fiends around you and you will be more outgoing and easy-going.
I hope you will find my advice useful
Yours sincerely
XXX

看了您的问题我是相当的无语啊.无聊之人问无聊之事,无聊之人答无聊之问,都是无聊的人?此类问题已经回答了,遍数262 懒到家为您回答

设李新原来X本
6X+2=4(X+2)
6X-4X=8-2
2X=6
X=3
原来李新3本,张磊18本

A Mouse in My Room There is a mouse in my room.
Mouse,mouse,I hate you.
Don't run to my bed.
Don't run to my bag.
Don't run to my socks.
Mouse,mouse,go away!
I don't like you.

没有什么故事背景,只能根据你的提示自己发挥了.
Dear Alice,
I hope everything goes well with you when you see this letter.

To be penfriend with you for more than 2 months, I really appreciate your help for my English,not only improved my Engish,also I learned much about your country.

I remeber you have said you are looking forward to Chinese new year festival, as you know shi is coming,We will make dumplings by hand and go around to the party hold by the famous street and the CCTV show together. It will be so wonderful if you can join us.I will introduce more Chinese traditional stories to you ,I believe you will enjoy it.

Pls write back to me a.sa.p,and I can';t wait to take you to join our Festival part.
Your sincerely
Lei Zhang
1-25-2013.
码字不容易,好的话请采纳.

12000qianke

提供2种答案

zhang lei is very good at playing basketball.

zhang lei plays basketball very well.

望采纳

李新有（4×2-2）÷（6-4）=3本
张磊有3×6=18本

张磊18本
假设张磊6本李新1本 不好算
假设张磊12本李新2本 也不好算
假设张磊18本李新3本 18是3的6倍 18÷3=6 18+2=20 3+2=5 20÷5=4 20是5的4倍
希望楼主采纳
谢谢

My name is Zhang Lei,9,Study at North department of Zhongyang Ningxing school in Class 1 Grade 3.I love English.

Dear John,
How time flies! I had the tests last week and got my report card today. I got 80 in math, and my math teacher said that I could do better. I got 90 in Chinese, and I am happy that the teacher said I was hard-working. You know that I like English very much, and I got 95 in it. The teacher said that I was good at speaking and reading. I only got 55 in science, and I am very sad. The science teacher said that I was a lazy student. As for PE, that is my favorite subject. I got 95. The teacher said that I ran fastest in my school. That’s so exciting.
I am looking forward to your letter!
Best wishes!
Yours,
Zhang Lei

你是不是想要英文版的?恩 Dear Rick, I am glad to hear that you will come to visit Tibet.You know, Tibet is 4,000 meters above sea level, sothere are many things you should be aware of. Firstly,...

假设李新在买书之前有X本书,因为张磊的故事书本数是李新的6倍,所以张磊有 6X 本,两人各再买2本后,张磊有 6X+2 本书,李新有 X+2本书
因为买书后张磊的本数是李新的4倍
那么,6X+2= 4（X+2）
所以X=3
那么原来,张磊有18本书,李新有3本书

dont like

最小公因数=(5+1)×(6+1)=42天
同时休息是11月21日

如果李新买2本,张磊买2×6=12本
那么张磊的书还是李新的6倍
现在张磊少买了12-2=10本
是李新的4倍
所以李新现在有10/(6-4)=5本
原来,
李新有5-2=3本
张磊有3×6=18本

解题思路：石块的质量直接用天平测量，本题的关键是测量石块的体积，采用等效替代的方法测量石块的体积，把溢水杯装满水，把石块轻轻放入装满水的溢水杯中，溢出水的体积等于石块的体积，想法测量溢出水的质量，水的密度是已知的，根据密度的推导公式可以求出．
装满水的溢水杯的质量+石块的质量=石块轻轻放入装满水的溢水杯的质量+溢出水的质量．

答：①用天平测出石块的质量m，
②将溢水杯装满水后测出水和杯的总质量m₁，
③小心地取下溢水杯，将石块轻轻地放入溢水杯中，再测出总质量m₂，
石块的体积等于排开水的体积，V_石=
m+m1−m2
ρ水，
石块的密度ρ=[m/v]=
m
m+m1−m2•ρ_水．

点评：
本题考点： 固体的密度测量实验．

考点点评： 测量石块的密度，无论所给的器材是什么，想办法直接或间接测量石块的质量和体积，根据密度公式可以求出．

19÷（7/15）= 285/7≈40.71（公里）

x/y=6
(x+2)/(y+2)=4
解方程：x=18,y=3

Hello,I am Zhanglei .I often get up at 6:50 and after breakfast,I go to school at 7:30.The class begins at 8:10.We have four classes in the morning.Ioften hav lunch at school at 12:00.Then,we have a short nap .We have three classes in the afternoon .It begins at 14:00 and at 17:00 i go home with my friends.That's all.Thank you.

Dear Zhang Lei,
The last time you English well on the test. If you want to learn English well, we should do:
Form the habit of reading English books, newspapers, and magazines, to write diary in English, from simple beginning, practice makes perfect, do the full practice, that your English will improve.
Li Ming.
翻译：
亲爱的张磊,
你上次英语考得不好.要想学好英语,应这样做：
养成阅读英语书籍的习惯,报刊,或杂志,用英语写日记,从简单的开始,熟能生巧,做充分的练习,那样你的英语就会不断提高.
李明.