8.1÷0.4+0.5的和乘以0.6脱式计算和简便算法

Question

8.1÷0.4+0.5的和乘以0.6脱式计算和简便算法

Answer 1

（8.1÷0.4+0.5）×0.6
=（8÷0.4+0.1÷0.4+0.5）×0.6
=（20+0.25+0.5）×0.6
=20×0.6+0.25×0.6+0.5×0.6
=12+0.15+0.3
=12.45本回答被网友采纳