-9y^2+6xy-x^2
2个回答
-9y^2+6xy-x^2=-(9y^2-6xy+x^2)=-(3y-x)²
相关问题
(3xy-9x2-2y2-6xy)-(6x2+2xy-3xy-y)
x^2+y^2+6y-2xy-6x+9
6x-6y-9x^2+18xy-9y^2-1
2x²+6x+y²=2xy-9,求xy平方
因式分解: x^2-3x+6xy+9y^2-9y
x^2-6xy+9y^2-3x+9y 因式分解
分解因式:x2-2xy+y2-6x+6y+9
约分:x²+y²-9-2xy/x²-y²+6x+9
化简.x^2-3xy/x^2-6xy+9y^2
x^2-6xy+9y^2-1=