计算:(x^2-9y^2)(x^2+3xy+9y^2)(x^2-3xy+9y^2)
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
化简:x-y/x+3y÷x^-y^2/x^2+6xy+9y^2-(xy/x+y)
(x^2+xy/x-y)/(xy/x-y)计算
计算3xy[2xy-x(y-2)+x-1]
计算:3xy[2xy-x(y-2)+x]
x-y/xy-y^2计算
计算:(5-xy/x^3-x^2y)/(1-5/xy)^2*(y-x)^3
用公式计算(2y-3x)(4y²+6xy+9x²﹚
计算:(x^2-y^2/xy)^2/(x+y)^2*(x/x-y)^3
计算3x[xy-2x(1/y-x/3]+3y(x²-y²)
计算(xy-y^2)÷x-y/xy
x*-2xy+3y*=9 4x*-5xy+6y*=30