请问如何化简(4x-y)/x^2y^2 - (x+y)/xy^3
5xy^2-[3xy^2-(4xy^2-2x^y)]+x^2y-xy^2如何化简
2x(x-y)4-x2(x-y)2+xy(y-x)2 如何因式分解
化简分式方程:x*x-xy-y*y/x*x-3x-6y+2xy
谁帮我化简:[(x+y)(x-y)-(x+y)^2-2y(x-y)-2xy]÷xy
①化简求值:2(x^2y+xy)-3(x^2y-xy)-4x^2y,其中x=1,y=-1.
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
化简求值:2(x的平方y+xy)-3(x平方y+xy)-4x平方y,其中x=-1,y=2
[x(x^2y^2-xy)-y(x^2-x^3y)]/3x^2y
(x+y)(x-y)-(2xy+3y)平方
x^2+y^2-x-y-xy+1如何因式分解
已知3x^2+xy-2y^2=0,求{(x+y)/(x-y)+4xy/(y^2-x^2)}/{(x+3y)*(x-y)}