14/25×12+7/25×14+42/25×2 简便运算

问题描述:

14/25×12+7/25×14+42/25×2 简便运算

提出14/25,即14/25乘以(12+7+6)得数14

14/25×12+7/25×14+42/25×2
=12×14/25+7×14/25+6×14/25
=(12+7+6)×14/25
=25×14/25
=14