0.8×9.9 1.1×0.8-0.8的简便脱式计算怎么写？

Question

如题所述

Answer 1

0.8×9.9 

=0.8×（10-0.1）

=0.8×10-0.8×0.1

=8-0.08

=7.92

1.1×0.8-0.8

=0.8×(1.1-1)

=0.8×0.1

=0.08

Answer 2

简便计算过程方法如下
解:0.8×9.9+1.1×0.8-0.8
=0.8×(9.9+1.1-1)
=0.8×10
=8

Answer 3

0.8x9.9=0.8x(10-0.1)=8-0.8=7.2
1.1x0.8-0.8=(1.1-1)x0.8=1x0.8=0.8

Answer 4

0.8*（9.9+1.1-1）=8

Answer 5

拆分和凑整来计算：
0.8*9.9 = 0.8 * （10 - 0.1） = 0.8 * 10 - 0.8 * 0.1 = 8 - 0.08 = 7.92
1.1 * 08 - 0.8 = （1 + 0.1） * 0.8 - 0.8 = 1 * 0.8 + 0.1 * 0.8 - 0.8 = 0.08