3y/（2x+2y）+2xy/（x^2+xy）

因式分解:12xy^2(y-x)+xy^3(x-y)+4x^2y(x-y) 计算：3xy[2xy-x（y-2）+x] X^Y-2XY^2+y^3 x根号x+x根号y/xy-y^2)-（x+根号xy+y/x根号x-y根号）y x²-y²+5x+3y+4（x+y-2xy)(x+y-z)+(xy-1）² (-x-y)(x^2+xy+y^2) 化简x^-y^/x^-2xy+y^ 2*(x-y)²(y-x)(xy) (xy-x²)÷(x²-2xy+y²/xy)×（x-y/x²） x-y/x²÷x²-2xy+y²/xy*（xy-x²） （x^2+xy/x-y)/（xy/x-y)计算 化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) 1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) [x(x^2y^2-xy)-y(x^2-x^3y)]/(2x^2y) [x(x^2y^2-xy)-y(x^2-x^3y)]/3x^2y [x(x^2y^2-xy)-y(x^2-x^3y)]/3x^2y 因式分解 x-xy+3y-3x 2x+xy-y-4x+5y-6 -2x(3x-7y)+(x-y)(x^2+xy+y^2） 计算