2x-y=5
5(y-2x)^2-3y+6x-60
=5(2x-y)^2+3(2x-y)-60
=5×25+3×5-60
=125+15-60
=140-60
=80
2x减y等于5,求5（y减2x）平方减3y加6x减60
2x减y等于5,求5（y减2x）平方减3y加6x减60
数学人气：911 ℃时间：2019-12-24 21:48:38
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