Question

简便运算（要过程）

1）0.25*0.125*3.2
2）（0.875-4/15*2又1/2）÷1/10
3）87*35/86

Answer 1

解：
1）0.25*0.125*3.2
=0.25×4×（0.125×0.8）
=1×0.1
=0.1
2）（0.875-4/15*2又1/2）÷1/10
=（0.875-2/3）÷1/10
=5/24×10
=25/12
3）87*35/86
=（86×35+35）×1/86
=35+35/86
=35又35/86

有什么不明白的可以继续追问，望采纳！

Answer 2

1）0.25*0.125*3.2
=0.25*0.125*4*8
=（0.25*4）*（0.125*8）
=1*1
=1
2）（0.875-4/15*2又1/2）÷1/10
=（7/8-2/3）×10
=70/8-20/3
=2又1/12
3）87*35/86
=（86+1）*35/86
=86*35/86+1*35/86
=35+35/86
=35又35/86

Answer 3

1）0.25*0.125*3.2（拆分3.2=4*0.8）
=（0.25*4）*（0.125*0.8）
=1*0.1
=0.1

2）（0.875-4/15*2又1/2）÷1/10
=（875/1000-4/15*5/2）×10（括号内约分）
=（7/8-2/3）×10
=5/24×10
=25/12
=2又1/12

3）87*35/86
=（86+1）*35/86
=86*35/86+35/86
=35+35/86
=35又35/86

Answer 4

1）0.25*0.125*3.2
=（0.25*4）*（0.125*0.8）
=1*0.1
=0.1

2）（0.875-4/15*2又1/2）÷1/10
=（7/8-4/15*5/2）*10
=（7/8-2/3）*10
=5/24*10
=25/12
=2又1/12

3）87*35/86
=（86+1）*35/86
=86*35/86+35/86
=35+35/86
=35又35/86

Answer 5

1）
0.25×0.125×3.2
=0.25×0.125×（4×0.8）
=（0.25×4）×（0.125×0.8）
=1×0.1
=0.1
2）
（0.875-4/15×2又1/2）÷1/10
=（0.875-4/15×3/2）×10
=（0.875-2/5）×10
=0.875×10-2/5×10
=8.75-4
=4.75
3）
87×35/86
=（86+1）×35/86
=86×35/86+1×35/86
=35+35/86
=35又35/86