3x^2-xy÷9x^2-6xy+y^2 等于多少

化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) (x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)答案应为-2x-x*x-3x， ①(9x²y-6xy²)÷3xy ②(3x²y-xy²+2分之1xy)÷(-2分之1xy) [ 2x-6y][8-9xy]÷xy等于? (9x^2y-6xy^2)/3xy 3xy(x^2y-xy^2+xy)-xy^2(2x^2-6xy+2x)过程 xy-2{xy-[3x^2y-(4xy^2+0.5xy)]+4x^2y}+6xy^2 （X-3xy+4xy-y）-[-2x-2（xy-3/2xy）-y]+6xy的过程 x^2-xy-6y^2+3xy+y+2 2x²y-3(2xy-xy)-xy 3x^2-xy÷9x^2-6xy+y^2 等于多少 5x^3y*(-3y)^2+(-6xy)^2*(-xy)+xy^3*(-4x^2) (x^2-xy)y÷y-x/xy怎么做? ( )*3xy=6x^2y+2xy^2 因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6 (xy-x²)÷(x²-2xy+y²/xy)×（x-y/x²） x-y/x²÷x²-2xy+y²/xy*（xy-x²） (-4x(2xy+3xy^2)+12(x^2y)^2y^3)÷（-6xy）