化简(3x^3-x^2y) / (3x^3+2x^2y-xy^2) = ( ) / (x+y)
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
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
(x+y)(x-y)-(2xy+3y)平方
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
化简(3x^3-x^2y) / (3x^3+2x^2y-xy^2) = ( ) / (x+y)
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y
化简[X(X^2Y^2-XY)-Y(X^2-2X^3Y)]/X^2Y
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)
已知x-3y=0,求(2x+y)/(x^2-2xy+y^2)X(x-y)
已知3x*+xy-2y*=0,求(x/y)-(y/x)-(x*+y*)/(xy)的值.*是平方