235*12.1+235*42.2-135*54.3 用简便方法计算
问题描述:
235*12.1+235*42.2-135*54.3 用简便方法计算
答
=(12.1+42.2)×235-135×54.3
=54.3×235-54.3×135
=(235-135)×54.3
=100×54.3
=5430