Question

第四题用简便方法计算怎么写

Answer 1

1, 4.8X0.25
=1.2X4X0.25
=1.2X1
=1.2

2, 1.5X105
=1.5X(100+5)
=150+7.5
=157.5

3, 0.78X98
=0.78X(100-2)
=78-1.56
=76.44

4, 0.3X2.5X0.4
=2.5X0.4X0.3
=1X0.3
=0.3

5, 0.5X2.33X8
=0.5X8X2.33
=4X2.33
=9.32

6, 1.2X2.5+0.8X2.5
=2.5X(1.2+0.8)
=2.5X2
=2

Answer 2

按顺序
(4+0.4+0.4)x0.25= 4X0.25=1这个地球人都知道
0.78X(100-2)=0.78X100-0.78X2=0.78X100-(0.8-0.2)x2

0.5X8X(2+0.3+0.03)
1.5X(100+5)
0.3X0.25X4

1.2X5X0.5+4X0.25X2

Answer 3

追答

求采纳

追问

第9提

简便运算

追答

太多了

先采纳