x²-2xy+y²-2x+2y+1
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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?
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?