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
4×60%+25分之19×40%﹢25分之19×60%
4×60%+25分之19×40%﹢25分之19×60%
数学人气:600 ℃时间:2020-02-03 13:23:26
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