x²-2xy+y²-2x+2y+1

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x²-2xy+y²-2x+2y+1x²-2xy+y²-2x+2y+1x²-2xy+y²-2x+2y+1x²-2xy+y²

x²-2xy+y²-2x+2y+1
x²-2xy+y²-2x+2y+1

x²-2xy+y²-2x+2y+1
x²-2xy+y²-2x+2y+1
=(x-y)²-2(x-y)+1
=(x-y-1)²

x²-2xy+y²-2x+2y+1
=(x-y)²-2(x-y)+1
=(x-y-1)²

你什么意思哦?