化简[X(X^2Y^2-XY)-Y(X^2-2X^3Y)]/X^2Y

化简：x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y) [x(x^2y^2-xy)-y(x^2-x^3y)]/3x^2y 因式分解：x×x-xy-2y×y-x-y (x+y)(x-y)-(2xy+3y)平方 1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y) （x^2+xy/x-y)/（xy/x-y)计算 化简(x平方-y平方)/(x+y)+(x平方-2xy+y平方)/(x-y) 化简:((根号x-根号y)^3+2x根号x+y根号y)/(x根号x+y根号y)+(3根号xy-3y)/(x-y) 化简:(x-3y)(x+y)-(x-2y)(x+2y)-(x-y)平方 作乘法:(x+y)(x^2-xy+y^2)；(x-y)(x^2+xy+y^2) 2xy/(x+y)(x+y)与x/(x+y)(x-y)怎么通分 x根号x+x根号y/xy-y^2)-（x+根号xy+y/x根号x-y根号）y