0.78×0.3=（）×3
0.78×0.3=0.234
0.234÷3=0.078
0.78×0.3=（0.078）×3
望采纳
简便运算过程如下
0.2×0.78×0.5
=（0.2×0.5）×0.78
=0.1×0.78
=0.078
希望可以帮到你
