(x^3-2x^2+xy^2)/(x-y)+(x+y)(y-x)=?
[x(x^2y^2-xy)-y(x^2-x^3y)]/3x^2y
因式分解:x×x-xy-2y×y-x-y
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^2+xy/x-y)/(xy/x-y)计算
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
(x+y)(x-y)-(2xy+3y)平方
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y
已知x*x-4xy+4y*y=0 求[2x(x+y)-y(x+y)]/(4x*x-4xy+y*y)的值?
(xy-x^2)乘以(xy)/(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