5x²y+10xy²-15xy
xy=(x-10)(y+1) xy=(x-15)(y+3) 解方程组.
[-(x-y)^2/xy]^-4*(y^2-xy/x)^3*(x^4/y^10)÷(xy-y^2/x)^-5=-y(y-
x^3y(-4y)^2+(-7xy)^2*(-xy)-5xy^3*(-3x)^2
先化简,再求值:[-xy/(x-y)^2]^4*(x^2-xy/x)3*x^4/y^10÷(x/xy-y^2)^5
X-Y=5,XY=3.XY是多少?
5x^2y/-1/2xy*3xy^2
X+y=3 xy=-5 Xy=?
(xy-x^2)乘以(xy)/(x-y)
计算:(xy-x²)×x-y/xy
已知x^2-xy=5,xy-y^2=-3求3(x^2-xy)-xy+y^2
已知x^-xy=5,xy-y^=-3,求式子3(x^-xy)-xy+y^的值
5xy^2-[3xy^2-(4xy^2-2x^y)]+x^2y-xy^2如何化简