(7.25乘以40%+2.75乘以5分之2)除以20%怎么做
问题描述:
(7.25乘以40%+2.75乘以5分之2)除以20%怎么做
答
[7.25*40%+2.75*(2/5)]/20%
=(7.25*40%+2.75*40%)/20%
=(7.25+2.75)*0.4*(100/20)
=4*5
=2 0