用简便方法计算:32×0.42+0.5×42+1.8×4.2
问题描述:
用简便方法计算:32×0.42+0.5×42+1.8×4.2
答
32×0.42+0.5×42+1.8×4.2
=32×0.42+50×0.42+18×0.42
=0.42×(32+50+18)
=0.42×100
=42