x^2-3xy+y^2/2x^2--3xy+5y^2已知x/y（y分之x）=2/3求上式子的值

因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) (x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)答案应为-2x-x*x-3x， -xy^2(x+y)^3+x(x+y)^2因式分解 (x+3y)/(x^2+xy)-x+y计算题 因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6 [x(x^2y^2-xy)-y(x^2-x^3y)]/3x^2y [x(x^2y^2-xy)-y(x^2-x^3y)]/3x^2y [x(x^2y^2-xy)-y(x^2-x^3y)]/(2x^2y) 化简：3x^2-[5xy-(x^y-3xy)+4x^2y-8xy] 计算：3xy[2xy-x（y-2）+x] 计算3xy[2xy-x(y-2)+x-1] （-3x^y+2xy)-( )=4x^+xy 1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) 计算：1-2x+x^2/x-x^3*xy+x^2y/x-x^2 化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) x*x+xy=3,xy+y*y=2,则x*x+2xy+y*y=________? (x^3-2x^2+xy^2)/(x-y)+(x+y)(y-x)=? 2x²y-3(2xy-xy)-xy