一班与二班人数的和占全年级人数的2/3,二班与三班人数的和占全年级的13/18已知二班56人.
一班与二班人数的和占全年级人数的2/3,二班与三班人数的和占全年级的13/18已知二班56人.
数学人气：750 ℃时间：2019-12-11 20:31:56
优质解答
一班、二班占2/3,二班、三班占13/18,可得一班、二班、二班、三班共占2/3+13/18=25/18所以二班占25/18-1=7/18 56除以7/18=144（人） 需要转换一下.
我来回答
类似推荐
猜你喜欢
- 1She is enough old to look after(照顾)herself.改错.
- 2My sister is ___(认真的)and she works hard
- 3翻译Every moment of our lives we are either living or dying,so live life to its fullest
- 4a=2008/2007,b=2009/2008,a-b
- 5小王和小丽两家相距5500米,小王每分走70米,小丽每分钟走90米,两人相向而行,
- 6如图,在六边形ABCDEF中,AF‖CD,AB‖DE,BC‖EF,且∠A=120°,∠B=120°,求∠C与∠D的度数
- 7She didn’t want to buy the house,_________.
- 8抛物线的顶点是(1,2),且过点(2,3) .
- 9I don't know if the meeting ------tomorrow ,if it-----on time ,I will go
- 10( )are you going to be an engineer?i'm going to study math really hard