因式分解:xy-7y=______.
因式分解:xy-7y=______.
因式分解:(x+y)(x+y+2xy)+(xy+1)(xy-1)=______.
因式分解:(x+y-2xy)(x+y-2)+(1-xy)2=______.
因式分解:16(x-y)2-24xy(y-x)=8(x-y)(______).
因式分解:1-x2+4xy-4y2=______.
因式分解:-3x2+6xy-3y2=______.
因式分解6xy+4x-9y-7=0
x^2-7xy+6y 因式分解
因式分解:x^2y+xy^2=?
因式分解:9x2-y2-4y-4=______.
已知x-y=5,xy=3,则3xy-7x+7y=______.
因式分解:8(x-2y)-x(7x+y)+xy.