分解因式9-6y-x²+y²
来源:学生作业帮助网 编辑:作业帮 时间:2024/06/30 01:33:17
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分解因式9-6y-x²+y²
分解因式9-6y-x²+y²
分解因式9-6y-x²+y²
9-6y-x²+y²
原式=9-6y+y²-x²
=(3-y)²-x²
=(3-y-x)(3-y+x)
9-6y-x²+y²
=(y²-6y+9)-x²
=(y-3)²-x²
=(y+x-3)(y-x-3)
3(3-2y)-(x+y)^2
=(x-y)的2-6(的x-y)9
=(-γ-3)2