xy^2-x^2y x^3y^2-4x
(-3x^y+2xy)-( )=4x^+xy
[x(x^2y^2-xy)-y(x^2-x^3y)]/3x^2y
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}
计算(x^8-x^7y+x^5y^3-x^4y^4+x^3y^5-x^y^7+y^8)(x^2+xy+y^2)
x^8-x^7y+x^6y^2-x^5y^3+x^4y^4-x^3y^5+x^2y^-xy^7+y^8
(xy-x^2)乘以(xy)/(x-y)
(x^-4y^)/(x^+2xy+y^)/(x+2y)/(2x^+2xy)
(x+y)(x-y)-(2xy+3y)平方
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