hp打印机墨盒怎么取出:若(x+1)(y-1)=1,x2y+xy2=-1 ,则(x2+y2)(x3-y3)=
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(x+1)(y-1)=1 推出xy-(x-y)=2
x2y+xy2=-1 推出:xy(x+y)=-1
(x2+y2)(x3-y3)=
因为(x-y)的平方等于x2+y2-2xy=3-2*1=1 所以 x-y = 1
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