4.69-0.4*7.5+5.31简便算法
问题描述:
4.69-0.4*7.5+5.31简便算法
答
4.69-0.4*7.5+5.31=(4.59+5.31)-(0.4×7.5)=10-3=7
答
4.69-0.4*7.5+5.31
=(4.69+5.31)-0.4*7.5
=10-3
=7