3X^25XY-2y^2+x+9Y-4谁知如何因式分解

因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) 化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) 因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6 (x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)答案应为-2x-x*x-3x， 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] 3x*x+5xy-2y*y+x+9y-4 3x*x+5xy-2y*y+x+9y-4请因式分解 化简2(x²y+xy)-3(x²y-xy)-4x²y （-3x^y+2xy)-( )=4x^+xy (x^2y-9y)/(xy+3y) 因式分解30题(要过程)am+an+bm+bn x^2+5y-xy-5x x2+xy+2xz+x (a+b)x-(b+a)y -12x(x-y)-(y-x)x^2 2x^2+4x+2 x(x+z)-y(y+z) 2(x^2-3ab)+x(4a-3b) 4x^2+12xy+9y^2-25 x^4-16 16x^4-1 x^2+9x+8 x^2-10xy+24y^2 2x^2+15xy-8y^2 3x^2-6xy+3y^2 24x^2+22x-21 -x^2+4xy- 因式分解：4a^2(x-y)+9(y-x) -4x^2y^2+x^3y+4xy^3 因式分解：4a^2(x-y)+9(y-x) -4x^2y^2+x^3y+4xy^3 x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² 4x-y/2根号x+根号y 9x-6根号xy+y/3根号x-根号y 因式分解3x2+xy-y2+x+9y-43X^2+XY-Y^2+X+9Y-4 已知X+Y=3,XY=-1,求2(X-Y)^4-9(X-Y)^2+12XY x²-y²+5x+3y+4（x+y-2xy)(x+y-z)+(xy-1）²