已知-x+2y=5,求5(x-2y)²-3(x-2y)-60的值,
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已知-x+2y=5,求5(x-2y)²-3(x-2y)-60的值,
已知-x+2y=5,求5(x-2y)²-3(x-2y)-60的值,
已知-x+2y=5,求5(x-2y)²-3(x-2y)-60的值,
解:因-x+2y=5,得-(-x+2y)=-5,即x-2y=-5
将x-2y=-5代入5(x-2y)²-3(x-2y)-60
5(x-2y)²-3(x-2y)-60
=5*(-5)²-3*(-5)-60
=125+15-60
=80