若2x-y=5,求5(y-2x)^2-3y+6x-60的值
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若2x-y=5,求5(y-2x)^2-3y+6x-60的值
若2x-y=5,求5(y-2x)^2-3y+6x-60的值
若2x-y=5,求5(y-2x)^2-3y+6x-60的值
5(y-2x)^2-3y+6x-60
=5(2x-y)^2+3(2x-y)-60
=5*5^2+3*5-60
=125+15-60
=140-60
=80
y-2x=-5,
5(y-2x)^2-3y+6x-60=5*(-5)*2-3(y-2x)-60=-50+15-60=-95
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