(X+Y)^2+2(X+1))+2y-1错了!2(X+1)+2Y-1中的-1呢?验算下给你看(x+y)*(x+y+2) =X^2+XY+2X+XY+Y^2+2Y-1到哪里去了?这步我算到过了。
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[(-x-y)(-x+y)-(x+y)^2-x(y-y^2)}÷1/2y
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(x-y)(2x-y-1)
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25(x-y)*2+10(y-x)+125(x-y)^2+10(y-x)+1
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