已知x-2y=-4,求5(x-2y)²-x+2y-60的值

已知x-2y=-4,求5(x-2y)²-x+2y-60的值

5(x-2y)²-x+2y-60
=5(x-2y)²-（x-2y）-60
=5*（-4）^2-(-4)-60
=5*16+4-60
=24

5(x-2y)²-x+2y-60=5(x-2y)²-(x-2y)-60
把x-2y=-4带入就可以了

5(x-2y)²-x+2y-60
=5(x-2y)²-(x-2y)-60
=5*（-4）²-（-4）+60
=80+4+60
=144

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5*4^2-(x-2y)-60=80+4-60=24