体育活动组男生人数是女生人数的三倍,男生比女生多20人

A seven day long holiday has flown away. Mourning my happy hours during the vacation, I've been looking forward to winter holidays. People around me seemed to have enjoyed the vacation, too. Then, is it fair that people have the same amount of holidays regardless of their occupations? 　　Nevertheless, divergent views emerge on the matter in question. Some people are of the opinion that laborers should have the same length of holiday. They hold the view that people are born equal and should be treated equally. The same amount of leisure time may eliminate the unfairness among people who might be upset psychologically if otherwise.
　　At first sight, it may seem to be an attractive idea, but it doesn't bear much analysis.
　　To begin with, people do different kinds of jobs featuring different labor intensity and so the time needed to refresh their physical condition varies. For example, blue collar workers may work longer hours before they get tired physically, while white collar workers such as doctors and teachers are more mentally stressed. Unable to work continuously as long as those physical labor workers, white collars need more time to pull through the mental weariness than physical tiredness.
　　All in all, people in different jobs assume different responsibilities and have different degrees of pressure.
　　Secondly, different tasks and duties are required for different professions, resulting in the variety of holiday periods for people in different walks of life.
　　Some employees cannot have their legal holidays and even have to work overtime, such as policemen, construction workers and people in the service line.Those professions just can't be interrupted for a mornent;other wise the society will be in a mess. Even for some people in the same occupation, they cannot have the same holidays entitled to them due to many factors out of human control, such as special assignments, and health conditions etc, then not to say people in different fields.
　　Suppose we, as teachers do, all have three months' holiday in a year.
　　Then factories have to employ considerably more workers because some of them are enjoying happy holiday.That's obviously against the principles of doing business at lower cost and efficiency.
　　If we have only three days off in a year, then all the people in our country will be working day after day. No one can squeeze time to visit those tourist resorts leisurely. It goes without saying that the tourist trade and catering industry thus cannot develop rapidly and healthily.
有什么问题 请随时提问 有问必答
这篇作文希望对你 有帮助 没有的话 我 在 去英语作文大全里面帮您找找看
一定会有你喜欢的作文哈 不过希望 找和自己水平差不多的 你找的太好了 老师以为你英文很好了
到考试 时候 就没那么理想了 所以建议 不要和自己水平差太多的
追问： = = 太多了.10句话就行.以 What do you usually do at weekends ?Well, I'd like to tell you something about my week-ends.开头,还要用上我给的词语.是题目要求

解题思路：我们在进行体育活动时，消耗的能量增多；呼吸作用消耗氧气，氧化分解有机物，释放能量，因此体育锻炼需要大量的氧气．人体的血红蛋白中运输的氧气不能够提供足够多的氧气，所以人要加深、加快呼吸而为有机物的分解提供氧气．

由分析可知，进行体育活动时，呼吸活动会使呼吸深度和呼吸频率都会加强，从而使呼吸肌得到锻炼，呼吸肌更发达，呼吸肌的收缩舒张力量加强；导致胸廓活动范围变大，参与呼吸的肺泡数目增多，但是不会增加肺泡的数目．
故选：A．

点评：
本题考点： 呼吸系统的卫生保健．

考点点评： 解答此类题目的关键是理解运动对呼吸系统的影响．

（1） 12÷
1
4 =48（人）；
答：该班一共有48人．

（2）48×25%=12（人）；
48-16-12-12，
=32-12-12，
=8（人）；
答：参加篮球活动小组的有12人，参加参加跳绳活动小组的有8人．

（3）（16-8）÷16，
=8÷16，
=50%；
答：参加跳绳活动小组人数比参加足球活动小组人数少50%．

度
同学们不是在室内开着空调取暖,而是到室外参加体育活动.

take part in the physical activities

People Wanted for Our Sports Day.
We want good football players and basketball players.Can you play football well?Can you play basketball well?We also want good runners.Please call …….

没有参加拔河比赛的有：72-72× 3 4 =72-54，=18（人）．没有参加跳绳比赛的人有：72-72× 3 4 × 2 3 =72-36，=36（人）．两项都参加的人数有：72-（36+18）=72-54，=18（人...

人数=15÷（1-2/5-4/15）=45人

篮球比足球比乒乓=1:3:2
设：篮球人为X,则足球3X,乒乓2X.
则6X=24
X=4
即：篮球4人,足球12人,乒乓8人.

Today is Monday. There are many children on the playground. Some are playing soccer, some are playing ping-pong, some are playing basketball, some are running, some are doing high-jump, and some are playing volleyball.

A赛马——5草原低于
B登山——4山地地区
C冲浪——1滨海地区
D溜冰——2我国东北地区
E赛龙舟——3河湖地区
估计你做完了.不过方便你对照一下吧

28+30-45=13（人），
答：两项活动都参加的有13人．
故答案为：13．

play sports from four thirty to five thirty.

参加竞赛要（用 ）心；体育活动要（小 ）心.

Jim loved all kinds of sports,for example,football and basketball

成绩优异的你,酷爱体育活动的你,给我留下了深刻印象.希望你在今后的生活中能够更加主动与他人交往,祝你有一个美好的未来.

24人、36人、42人的最大公约数是6
所以,每组最多6个人.
分别可以分组24/6=4组,36/6=6组,42/6=7组

求三个班人数的最大公约数：是6,即每组最多6人.因此三个班可分别分为4、6、7个小组,共17个小组

没有只参加一项活动的学生
班上的每个同学都至少参加两项活动,那么就是该班总人数=5+11+10+9=34

最少有59个人 因为题目的意思就是不管站3,4,5,6排都缺一个人,所以只要求3,4,5,6的最小公倍数再减去1,即为所求最少人数~

直觉,59人.
但是算起来解是无限多个的,因为没有给约束条件,比如人数不超过100.
具体解法：y/3=整数余-1,y/4=整数余3,y/5=整数余-1
根据特点,先取3,4,5的最小公倍数,按照3和5的特点,应是59,再用4去验证,是对的.所以59是一个解.类推下去,最小公倍数乘2,得到119也是解；乘3,4,5,6..都可以求解一个值,因而如果不加限制,解是无限多个的.

解题思路：（1）利用小组频数÷所占百分比=样本总数即可得出答案；
（2）利用样本中报名排球的人数除以总数得出即可．

（1）160÷40%=400（人），
答：该校学生报名总人数为400人；

（2）由样本估计总体可知：
[400−100−40−160/400]×100%=25%，
答：估计该校选排球的人数占报名总人数的25%．

点评：
本题考点： 条形统计图；用样本估计总体；扇形统计图．

考点点评： 此题主要考查了条形统计图与扇形图的综合应用以及利用样本估计总体，根据条形图与扇形图得出正确的信息是解题关键．

解题思路：（1）动能大小的影响因素：质量、速度．质量越大，速度越大，动能越大．
（2）重力势能大小的影响因素：质量、被举得高度．质量越大，高度越高，重力势能越大．

运动员离开蹦床弹向空中的过程中，质量不变，速度减小动能减少；但所处高度增加重力势能增加．
故选D．

点评：
本题考点： 动能和势能的大小变化．

考点点评： 我们可以从影响能量大小的因素来分析能量的变化．

I like play basketball very much.Because it can bring me many advantages.i can keep healthy by keeping playing basketball.And I can get happiness from it .What's more I can get some friends from it.

Health is very important to us teenagers. Either study or work is based on strong body. Doing sports every day helps us keep healthy and energetic. And taking exercise can keep us strong, we won’t get tired or sick easily. Just as the slogan says, “Exercise one hour a day keeps illness away.”
There are many kinds of sports we can do, such as running, swimming and ball games. Now we students have to do too much homework after school. I hope teachers will leave us less home work so that we can have more time to take part in sports. I also hope our school can organize more sport activities for us.

刚开始时 篮球总个数 21×（5/7）=15
足球个数 21-15=6
买来篮球后 足球占总数的 1/6.
所以 总个数 6÷（1/6）=36
所以买来了36-21=15个篮球

1. The school has a sports meeting every year. You were the winner of long jump last year.
2. The students usually do exercises in the morning, do eye-protection in the afternoon and play basketball or football after class.
3. Sports are good for your health. You are going to do exercise.

难度大,没有时间搞.要分各种情况,有最简单的一种,假设参加活动中会四项的最多,那么会四项的有60个,再会三项的最多,就有24个,会两项的有56个,会一项的就是210-140=70个,不会的就是=420-60-24-56-70=210个.

A.吃进的食物被消化 在分解酶的作用下将淀粉分解成葡萄糖和果糖
B.体育活动后,呼吸作用增强 加强呼吸作用,加速能量分解
C.人吸入氨基酸,结合成所需的蛋白质 产生了新物质蛋白质
D.水放进冰箱后结成冰 只是存在状态发生变化,没有产生新物质

解题思路：（1）根据图示，可把参加所有体育活动的人数相加即可得到全班的人数；
（2）根据条形统计图可知，喜欢踢皮球的人最多，喜欢打篮球的人最少；
（3）可用喜欢打篮球的人数20人减去喜欢踢皮球的人数8人即可；
（4）根据统计图，我想学校可以多购买一些皮球，少购买一些篮球．

（1）12+14+20+8+16=70（人），
答：全班有70人；

（2）喜欢踢皮球的人最多，喜欢打篮球的人最少；

（3）20-8=12（人），
答：喜欢打篮球的人数比喜欢踢皮球的人数多12人；

（4）根据统计图，我想学校可以多购买一些皮球，少购买一些篮球．
故答案为：70，踢皮球，打篮球，12．

点评：
本题考点： 以一当二的条形统计图；从统计图表中获取信息．

考点点评： 此题主要考查的是如何从条形统计图中获取信息，然后再根据信息进行分析计算即可．

"Now we take exercise an hour every day, the school for us to undertake various kinds of sports activities"

24/30=0.8 不就正好少20%了吗?

Who can prove that he wasn't at the scene at the moment?
It is said that everyone in her class takes an active part in sports activities.

10人
设女生人数为x,则男生为3x,3x-x=20
x=10

144÷(3+2+1)=24
(144-24)÷2+24=84
84÷2÷2=21
(144-24)÷2=60
(60+24)÷2=42
144-44-21=81
答：甲最初有81个人,乙最初有42个人,丙最初有21个人.

1、用take part in造句.
约翰总是积极参加各种体育活动.
John always takes an active part in all kinds of sports activities.
2、take sth into account/ take account of sth 造句.
只要有可能,这家公司总是考虑到环境问题.
Whenever (it is) possible, the company takes environmental problems/issues into account at all times.
Whenever (it is) possible, the company takes account of environmental problems/issues at all times.
3、on no account /not on any account 造句.
你决不能在考试中作弊.
On no account should you cheat at examinations.
You must not cheat at examinations on any account.
4、on account of sth 造句.
由于糟糕的天气我们推迟了行程.
We delayed our departure on account of the bad weather.
5、get to do sth 造句.
我没在网上逐渐了解对方.
I did not get to understand the opposite on the internet.
6、hunt of 造句.
（1）为什么你想要找份兼职工作.
Why do you want to hunt of a part-time job?
（2）警察正在搜索那个小偷.
The police are hunting of that thief.
7、belong to 造句.
（1）这个房子是属于我的.
The house belongs to me.
（2）这部车属于谁?
Whom does the car belong to?

My School Sport
I study at No. 2 Middle School. There is a sports meeting in our school every autumn/Our school holds a sports meeting every autumn/A sports meeting is held in our school every autumn. I took the first place/was first in the long jump/won the long jump last year. We usually take exercise in the early morning. We do eye exercises in the afternoon. After school/class we play basketball or football. My favourite sport is football/I like football best. I often watch a football match on TV on Sundays. I think(doing)sport is good for our health/(doing) sport makes us heathier and stronger. I am going to take/do more exercise/do more sport.

（1）200；（2）“图”略；（3）150人

D

关联词语使用不当.
只要经常参加体育活动,就能增强自己的体质.

解题思路：（1）已知杨威同学的路程s与运动时间t，由速度公式v=[s/t]可求出他的平均速度．
（2）先利用公式W=Fs求出杨威举起杠铃时做的功，然后再根据功率公式P=[W/t]求功率．

（1）杨威同学的路程s=100m，运动时间t=16s，则他的平均速度v=[s/t]=[100m/16s]=6.25m/s．
（2）杠铃质量m=30kg，时间t=4s，高度h=2m，则杨威举杠铃做的功W=Fh=mgh=30kg×10N/kg×2m=600J．
他的功率P=[W/t]=[600J/4s]=150W．
答：（1）杨威同学100m跑的平均速度是6.25m/s．
（2）他举起杠铃的功率是150W．

点评：
本题考点： 速度的计算；功率的计算．

考点点评： 本题考查平均速度、功与功率的计算，是一道基础题．

解题思路：这类问题答案并不唯一，首先回顾打篮球的过程提出相应的现象，其次现象要典型直观，不能太浅，最后明确所提出的现象包含的物理规律，才是成功的．

该题目中给出的示例条件是“篮球碰撞地面会向上弹起”，我们可以依据这个条件继续联想，“篮球出手后会在空中运动”，对应的道理是具有惯性；“篮球不会一直向上运动而是下落”，对应的道理是受重力的作用；“篮球上升速度越来越慢”，对应的道理是动能转化为重力势能；“篮球下落速度越来越快”，对应的道理是重力势能转化为动能等，当然也可以发挥想象，作其他答案．
故答案为：

篮球的结构和打球的过程 对应的物理知识
示例 篮球碰撞地面会向上弹起 弹性势能转化为动能
1 篮球出手后继续运动 惯性
2 篮球下落 重力

点评：
本题考点： 力的作用效果．

考点点评： 本题是一道开放性试题，主要考查学生应用物理知识解释物理现象的能力．要求基础知识点掌握准确，结合具体现象能顺利表达出来．

原样本近似为正态分布...
用矩估计做...
置信区间用 -α/2

1.I am very fond of sports in my spare time ,especially playing football.I have been a football fan for years ,and now Barcelona Club is my favorite team.Anyway,I feel great pity for our country’s te...

In the sports room

Tom like collecting sports goods. He has six footballs , ten basketballs and two tennis rackets. He participates in sports activities everyday, he also watches sports matches on TV
是要翻译嘛

3个排球的钱为245-161=84,
一个排球为84/3=28,
则3个篮球为161-2x28=105,
则一个篮球为105/3=35