小学简便计算题,高悬赏

3.2*25*12.5
=0.4*8*25*12.5
=0.4*25*(8*12.5)
=10*100=1000

5.32-0.375+0.68-0.625
=5.32+0.68-（0.375+0.625）
=6-1=5

(1/2+1/5)除(5/6-3/4)
=（2.5+1）/5/(1-1/6-1+1/4)
=0.7/(1/4-1/6)
=0.7*12
=8.4

2/9除[(3/5+1/2)*10/11]
=2/9/[(3/5+2.5/5)*10/11]
=2/9/(5.5/5*10/11)
=2/9/1
=2/9

错，答案为比值增大到25倍
乙班人数多。

3.2×25×12.5
=4×2.5×0.8×12.5
=10×10
=100

5.32-0.375+0.68-0.625
=5.32+0.68-0.375-0.625
=6-1
=5

1.（X）
2.（乙班）
谢谢。

3.2*25*12.5
=0.4*25*8*12.5
=10*100
=1000

5.32-0.375+0.68-0.625
=5.32+0.68-0.625-0.375
=6-1
=5

(1/2+1/5)除(5/6-3/4)
=7/10*12
=42/5

2/9除[(3/5+1/2)*10/11]
=2/9/(11/10*10/11)
=2/9

一个比的前项扩大5倍,后项缩小5倍,比值不变(错 )

甲班人数的1/2等于乙班的1/3,那么( 乙班 )( 哪个班的人数多 )

3.2*25*12.5=4*0.8*25*12.5=1000
5.32-0.375