x^+3xy - 10y^ - x+9y - 2 .其中^为指数，指数为二。

-x-3xy+y 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， 【x(xy-xy)-y(x-xy)】÷3xy (x^2y-9y)/(xy+3y) x-y=3,xy=9,x+y=? 已知x^2+9y^2-2x-6y+2=0,求{-（xy/（x-y）^2}^4*(y^2-xy/x)^3*x^4/y^10/(x/xy-y^2)^5的值 已知2x+xy=10,3y+2xy=6.求4x+8xy+9y=? 因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) |x|/x+y/|y|+xy/|xy|= 1.24xy^4+2x^3y^2-2x^5 2.4x^4y^2-5x^2y^2-9y^2 3.24x^2y-30xy-75y 4.10(y+2)^2-29(y+2)+101.24xy^4+2x^3y^2-2x^5 2.4x^4y^2-5x^2y^2-9y^2 3.24x^2y-30xy-75y 4.10(y+2)^2-29(y+2)+10 1.24xy^4+2x^3y^2-2x^5 2.4x^4y^2-5x^2y^2-9y^2 3.24x^2y-30xy-75y 4.10(y+2)^2-29(y+2)+101.24xy^4+2x^3y^2-2x^5 2.4x^4y^2-5x^2y^2-9y^2 3.24x^2y-30xy-75y 4.10(y+2)^2-29(y+2)+10 已知x-y=3xy,且xy不等于0,则-3x+6xy+3y/(7x-5y)-9xy-(3x-y) -3x²×（三分之一xy-y²）-10x（x²y-xy²） X^Y-2XY^2+y^3 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- x^2+y^2=10,x-y=4,求x,y x+y=-5,xy=4,求x-y x+y=9,xyx^2+y^2=10,x-y=4,求x,y x+y=-5,xy=4,求x-yx+y=9,xy=10,求x^2+y^2,x^3+y^3,x^4+y^4 因式分解：3xy(x-y)+6y(y-x)