化简.x^2-3xy/x^2-6xy+9y^2
化简.x^2-3xy/x^2-6xy+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)
化简:5根号X^3Y-2Y根号XY-6根号XY+根号X分之Y+根号Y分之X
x^2-xy-6y^2+3xy+y+2
(xy-x^2)乘以(xy)/(x-y)
化简!1、(x^2-xy)+xy+y^2 2、3(x^2-xy)-xy+y^2
x*-2xy+3y*=9 4x*-5xy+6y*=30
计算3xy[2xy-x(y-2)+x-1]
计算:3xy[2xy-x(y-2)+x]
(-3x^y+2xy)-( )=4x^+xy
x^2-2xy+y^2+3x-3y+2 x^2+(a+1)x-(6a^2-13a+6) x^2+xy-2y^2+2x+