3x^3＋6x^2y＋3xy^2

(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y) （x＋2y-3xy）-（-2x-y+xy）,其中x+y=,xy=-,求值. 1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) 化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) x^2-xy-6y^2+3xy+y+2 因式分解x^4y-x^2y^3＋x^3y^2-xy^4 化简分式方程:x*x-xy-y*y/x*x-3x-6y+2xy 已知:x/y=-2,求x^2-2xy-3y^2/x^-6xy 已知xy/x+y=6,求3x-2xy+3y/-x+3xy-y的值. x^+2xy+y^+4=16 x^-2xy+y^=16 求(3xy+6y^)+|x^-(2xy+2y^-3x^)|的值 3y/2x+2y＋2xy/x²+xy 2x/x²-64y²－1/x-8y (1/a+1/b 化简：5根号X＾3Y－2Y根号XY－6根号XY＋根号X分之Y＋根号Y分之X