(-1/3xy)^2•[xy(2x-y)-2x(xy-y^2)]
(xy-x^2)乘以(xy)/(x-y)
计算3xy[2xy-x(y-2)+x-1]
(x+y-2xy)(x+y-2)+(1-xy)²
xy(xy+1)+(xy+3)-2(x+y+2分之一)-(x+y-1)的平方
(-3分之1xy)的平方×[xy(2x-y)-2x(xy-y的平方)]
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
5x^2y/-1/2xy*3xy^2
y^3+xy^2+2xy+x^2-1 因式分解
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
化简!1、(x^2-xy)+xy+y^2 2、3(x^2-xy)-xy+y^2
x^2-xy-6y^2+3xy+y+2
(x^2+xy/x-y)/(xy/x-y)计算