三2班订杂志的同学中,有12人订了科普世界,有18人订了小哥白尼,其中有5人两种杂志都订

每个人捐钱
=20÷（50-46）
=20÷4
=5元

设三1班为x,三2班为y,三3班为z
由题目可知
x+y+z=101
y-x=5 x=y-5
z-y=4 z=4+y

y-5+y+4+y=101
y=34 x=34-5=29 z=4+34=38
三1班订书29份,三2班订书34份,三3班订书38份.

35+39-52

二班比一班少30千克,二班为:120-30=90千克三班是二班的2倍,三班为:90*2=180千克三个班级一共装苹果120+90+180=390千克 很高兴为您解答...

5人

平均每组11人

60×3/5

A Sports Meeting
/-
Yesterday our grade held a sports meeting.We have six classes in our grade.All the classes did very well.
In the Boys' 100-metre race,I.Jn I.in from Class 2 won the first.At first,Zhang Lin from our class and I.in %ao from Class 1 were neck and neck.Lin Lin fell behind,but,finally he tried his best and came out first.
In the Girls' 100-metre race,Mei Mei ran the fastest,and Zhang Fang from Class 4 and Li Ming from Class 5 were both fell behind.But they tried their best,and that was enough.
In the High Jump,when Jin Ling jumped 1.80 metres high,all the classes stood up and cried,"Well done!Congratulations!" But Liu Tao from our class also did very well,he jumped 1.71 metres high and Chen Hao,1.56 metres high.
In the Long Jump,Zhang Ming from Class 2 was the top.He jumped 7.78 metres long.Zhou Ping and Gao Lin from Class 4 and Class 6 were both very good.
Finally,our class won the second.We were all very happy.
Our headmaster told us to do our best in everything.

21+18-36=3

18÷（1-2/5）=18÷3/5=30

20÷(50-46)
=20÷4
5
答：平均每人捐5元.

可以设三2班第订x份,三1班订（x-5）份,三3班订（x+4）份
依题意得：x+(x-5)+(x+4)=101
3x-1=101
3x=102
x=34
所以三1班订34-5=29份,三3班订34+4=38份

设第三组x本
x+x+6+x+6+4=49
3x+16=49
3x=49-16
3x=33
x=11
如还有新的问题,请不要追问的形式发送,另外发问题并向我求助或在追问处发送问题链接地址,

21+29-10=40
答：一共有40人答优.

We are from grade three class two of Jingtian

（3+2）X（8+7）=6X15=90（人）

（32+35+7）÷2＝37

三一班减五等于三二班加五,X-5=Y+5 所以Y=X-10 三1班比三2班多十人

一共要投进
29x3+4+1
=87+5
=92个