3x^2y-4xy^2+2x^2y+xy^2
(xy-x^2)乘以(xy)/(x-y)
(-3x^y+2xy)-( )=4x^+xy
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
已知x-y=4xy,则2x+3xy-2yx-2xy-y
(x^2+xy/x-y)/(xy/x-y)计算
x^2-xy-6y^2+3xy+y+2
x^2y+4xy+4y
5xy^2-[3xy^2-(4xy^2-2x^y)]+x^2y-xy^2如何化简
(2x²y-3xy²)-3(x²y-2xy²)+2(x²y-4xy
已知x-y=4xy,求x-2xy-y分之2x+3xy-2y的值!
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)