一.3.2X1.4+5.62 二.10-1.8X1.2 怎么简便算啊

问题描述:

一.3.2X1.4+5.62 二.10-1.8X1.2 怎么简便算啊

1.3.2×1.4+5.62
=3.2×(1+0.4)+5.62
=3.2×1+3.2×0.4+5.62
=10.1
2.10-1.8×1.2
=10-1.8×(1+0.2)
=10-1.8×1+1.8×0.2
=10