0.79乘以1.9减去1.79乘以1.35简便方法是什么

题目

0.79乘以1.9减去1.79乘以1.35简便方法是什么

答案

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