0.4×125×25×0.8
=（0.4×25）×（125×0.8）
=10×100=1000
1.25×（8+10）
=1.25×8+1.25×10
=10+12.5=22.5
9123-（123+8.8）
=9123-123-8.8
=9000-8.8
答:六年级上册脱式计算如下:
3/5X1/3十3/5X4/3
=3/5X(1/3十4/3)
=3/5X5/3
=1
1/8X(8十4)
=1/8X8+1/8X4
=1十1/2
=1十O.5
=1.5
98X1/97
=(97十1)Ⅹ1/97
=97㐅1/97十1/97
=1十1/97
=1(1/97丿(即:一又九十七分之一)
7/25㐅5/3X5/14
=7/25X5/14X5/3
=1/50X5/3
=1/30
1/50Ⅹ99十1/50
=1/50X(99十1)
=1/50X100
=2。
