7.68x101 0.125x72 (0.8x4.27) x1.25 0.25x39+0.25 3.6x99 12.5x9-12.5 上面这些题用拖式计算快点

Question

如题所述

Answer 1

7.68x101
=7.68*100+7.68*1
=768+7.68
=775.68

0.125x72
=1/8*72
=9

(0.8x4.27) x1.25
=4/5*4.27*5/4
=4.27

0.25x39+0.25
=0.25*（39+1）
=1/4*40
=10

3.6x99
=3.6*100-3.6
=360-3.6
=356.4

12.5x9-12.5
=12.5*（9-1）
=12.5*8
=100