(-2xy)
【(2+xy)(xy-2)-xy(xy+1)+4】/(-2xy) 一道计算题!
计算:3xy[2xy-x(y-2)+x]
1、xy²+2xy-x(因式分解)
化简!1、(x^2-xy)+xy+y^2 2、3(x^2-xy)-xy+y^2
化简:[(xy-2)(xy+2)-2x2y2+4]÷(xy).
分解因式:(X+Y)*(X+Y+2XY)+(XY+1)*(XY-1)
计算:12xy+(3x2-5xy)-2(3xy+2x2).
xy(xy+1)+(xy+3)-2(x+y+2分之一)-(x+y-1)的平方
x-y/x²÷x²-2xy+y²/xy*(xy-x²)
3xy-3xy-xy+2yx
① 先化简,再求值.【2x(xy-xy)+xy(xy-x)】÷xy,其中x=2013,y=2012
3(x的2次方y+xy)-4(xy-2x的2次方y)-(-xy)化简