x²+y²-2xy+2x-2y+1 用分组分解法因式分解
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x²+y²-2xy+2x-2y+1 用分组分解法因式分解
x²+y²-2xy+2x-2y+1
=(x²-2xy+y²)+2(x-y)+1
=(x-y)²+2(x-y)+1
=(x-y+1)²
x²+y²-2xy+2x-2y+1 用分组分解法因式分解
x²+y²-2xy+2x-2y+1
=(x²-2xy+y²)+2(x-y)+1
=(x-y)²+2(x-y)+1
=(x-y+1)²