x²+6XY+9Y²-2X-6Y+1因式分解

-9x²-y²+6xy 6xy²-9x²y-y²因式分解 x²-y²+6x+9分之x²+y²-9-2xy 6xy²-9x²y-y³ 6xy²-9x²y-y³因式分解 6x²y-9xy-xy²+3x²y x²-2xy+y²-9 因式分解-x²+6xy-9y² 1-x²-9y²+6xy因式分解 6xy²-9x²-y³ x²-9x²y²+6xy-1a²b²+16ab+60 约分（初二数学的分式）x²+y²-9-2xy/x²-y²+6x+9 x²+9y²+4z²-6xy+4xz-12yz怎么分解? x²-6xy+9y²+4z²-12yz+4xz分解多项式 x²+xy-2y²-x+7y-6 6x²-xy-15y²=0 求x²-2xy+4y²/2x²-3xy-3y²告诉下 6x²-xy-15y²=0 求2x²-3xy-3y²分之x²-2xy+4y² 计算或化简：[（x-y）/(x+3y)]÷[（x²-y²）/(x²+6xy+9y²)]-（2y）/x+y