4×60%+25分之19×40%﹢25分之19×60%
问题描述：
4×60%+25分之19×40%﹢25分之19×60%
答
4×60%+25分之19×40%﹢25分之19×60%
=4x0.6+19/25x(40%+60%)
=2.4+19/25x1
=2.4+0.76
=3.16