3x/2x+2y + 2xy/x^2+xy
(xy-x^2)乘以(xy)/(x-y)
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*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]
(-3x^y+2xy)-( )=4x^+xy
x^2-xy-6y^2+3xy+y+2
因式分解:(2x-y)(x^2+xy-2y^2) xy(x^2-xy)(-3xy^2)
由已知x+y=-2,xy=3那么2(x+xy)-[(xy-3y)-x]-(-xy)等于多少?
(x+y-2xy)(x+y-2)+(1-xy)²
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
(x^2-xy)y÷y-x/xy怎么做?