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x^2+y^2+6y-2xy-6x+9
题目详情
x^2+y^2+6y-2xy-6x+9
▼优质解答
答案和解析
原式=(x²-2xy+y²)-6x+6y+9
=(x-y)²-6(x-y)+9
=(x-y-3)²
=(x-y)²-6(x-y)+9
=(x-y-3)²
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