(X-9y)/(6xy^2-(x+3y)/(9x^2y)

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、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) 因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6 x^2-xy-6y^2+3xy+y+2 (9x^2y-6xy^2)/3xy 求x^3 - 6x^2y + 11xy^2 - 6y^3 思路x^3 - 6x^2y + 11xy^2 - 6y^3= x^3 - 3x^2y + 2xy^2 - 3x^2y + 9xy^2 - 6y^3= (x^2 - 3xy + 2y^2)(x - 3y)= (x^2 - 2xy - xy + 2y^2)(x - 3y)(x - y)(x - 2y)(x - 3y)求思路 (X-9y)/(6xy^2-(x+3y)/(9x^2y) 2x-3y/xy×2x^2y^2/6x-9y 9x^2y+y^3-6xy^2因式分解 因式分解6xy^2-9x^2y-y^3 6xy^2-9x^2y-y^3因式分解 x^2y-6xy^2+9y^3 6xy-9x^2y-y^3 因式分解 3y/x*x-y*y+x/x*x-2xy+y*y+6y*y/x*x*x-x*x*y-xy*y+y*y*y等于多少? -3x^2y+6xy^2-9xy=( )(x-2y+3) 9xy(x-y)(x+1)-3y(x-y)(3x+2y)+6y的平方(x-y)(x+1),因式分解 4x-y/2根号x+根号y 9x-6根号xy+y/3根号x-根号y