0.79乘以1.9减去1.79乘以1.35简便方法是什么
问题描述:
0.79乘以1.9减去1.79乘以1.35简便方法是什么
答
0.79×1.9-1.79×1.35
=0.79×1.9-(1+0.79)×1.35
=0.79×1.9-0.79×1.35-1×1.35
=0.79×(1.9-1.35)-1×1.35
=0.79×0.55-1.35
=0.4345-1.35
=﹣0.9155
希望对你有用