(-1/3xy+3/2y^2-x^2)(-6xy^2)
(x-2xy)*(-xy+2y*y)-(3x*x-2xy)(x-9xy+6y*y)
x^2-xy-6y^2+3xy+y+2
计算3xy[2xy-x(y-2)+x-1]
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)]
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
5x^2y/-1/2xy*3xy^2
y^3+xy^2+2xy+x^2-1 因式分解
化简!1、(x^2-xy)+xy+y^2 2、3(x^2-xy)-xy+y^2
1、(-7x^y)(2x^y-3xy^3+xy) 2、((x-y)^6)/((y-x)^3)/(x-y)
[3xy(1-x)-6xy(x-1/2)]*2x*(-xy)平方,x=-1 y=2 ; 3xy平方(-1/3x平方y+4
(1)已知x+y=6,xy=-3,x^2y+xy^2=