已知 -X+2Y=5,则5(X-2Y²)-3(X-2Y)-60的值
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已知 -X+2Y=5,则5(X-2Y²)-3(X-2Y)-60的值
已知 -X+2Y=5,则5(X-2Y²)-3(X-2Y)-60的值
已知 -X+2Y=5,则5(X-2Y²)-3(X-2Y)-60的值
5(X-2Y)²-3(X-2Y)-60
=5*(-5)²-3*(-5)-60
=125+15-60
=80