(x-y)(x+y)-(x+y)+2y(y-x),其中x=1,y=3
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(x-y)(x+y)-(x+y)+2y(y-x),其中x=1,y=3
(x-y)(x+y)-(x+y)+2y(y-x),其中x=1,y=3
(x-y)(x+y)-(x+y)+2y(y-x),其中x=1,y=3
原式=x-y-x-2xy-y+2y-2xy=-4xy=-12
x-y-x-2xy-y+2y-2xy=-4xy=-12
自己不会做?
-12
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