已知-x+2y=5,则 5(x-2y)^2-3(x-2y)-60的值为?

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已知-x+2y=5,则5(x-2y)^2-3(x-2y)-60的值为?已知-x+2y=5,则5(x-2y)^2-3(x-2y)-60的值为?已知-x+2y=5,则5(x-2y)^2-3(x-2y)-6

已知-x+2y=5,则 5(x-2y)^2-3(x-2y)-60的值为?
已知-x+2y=5,则 5(x-2y)^2-3(x-2y)-60的值为?

已知-x+2y=5,则 5(x-2y)^2-3(x-2y)-60的值为?
-(-x+2y)=-5 x-2y=-5 -1y=-5 x=5

-x+2y=5 -(X-2y)=5 X-2y=-5 5(x-2y)^2-3(x-2y)-60 =5*(-5)^2-3*(-5)-60 =125+15-60 =80