25乘0.35+2.4乘1.5用简便方法计算
问题描述:
25乘0.35+2.4乘1.5用简便方法计算
答
25×0.35+2.4×1.5
=2.5×3.5+(2.5-1)×1.5
=2.5×3.5+2.5×1.5-1×1.5
=2.5×(3.5+1.5)-1.5
=2.5×5-1.5
=12.5-1.5
=11