学校体育馆10张乒乓球桌上一共有28个同学在比赛,你知道正在单打和双打的乒乓球各有几桌吗?（不要方程）

36x【1-九分之四】=20 20除以【1-19分之9】=38 38-36=2

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We will hold a badminton match at our school stadium on 2:30 pm November,6th.
student who want to take part in the match have to register before friday.
we don't provide rackets for players. please bring your own racket.

3.5*3*200=2100平方米

设足球为5x个,则排球为3x个,那么篮球则为42-（5x+3x）个,球总数为（42-8x）除以3/7个
剩下的你自己算吧,题没出全.

2645 可爱的答案

不会，但请你上百度，能给金币吗？谢谢了。

设篮球买了x个,则足球买了20-x个
110x+90(20-x)=2040
110x+1800-90x=2040
20x=240
x=12
20-12=8(个)
12-4=4(个)
答：足球和篮球相差4个

（1）有长方体的面积公式可得：
50×30+50×3×2+30×3×2=1980平方米；
答：共需要1980平方米的瓷瓦．
（2）由长方体的体积公式可得50×30×2=3000立方米；
答：需要注水3000立方米．

Our Out-of-class Activities
Nowadays more and more schools encourage their students to take part in after-class activities. As everyone knows, just like study in class, after-class activities play an important role in the growth of the students.
After school, I will take part in some after-class activities such as play basketball and go jogging and so forth. In my opinion, after-class activities can help us to study more effective. And a wide variety of after-class activities is a necessary complement to classroom study. So we should learn how to combine the learning in the classroom and the extracurricular activities.

5级台阶共占地0.4*5*5=10平方米,台阶铺上地砖（如果带上踢脚面）（0.4+0.3）*5*5=17.5平方米

设原来有球x个
则 有篮球60%x=0.6x个
则有排球x-0.6x=0.4x个
则 （0.6x）：（0.4x+120）=1:2
解得 x=150
则 原来有篮球150*0.6=90个

设单打的有x桌,双打的就是（10-X）桌,得方程
2X+4（10-X）=28
2X=12
X=6
所以10-X=4
单打的有6桌,双打的有4桌

占地不用计算高度,4×0.35×3=4.2

24÷6/7=28

您好：
2:3=8:12
4:5=12:15
所以三个区的比是 8:12:15
a区少
1400÷（8+12+15）x8
=1400÷35x8
=320个


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