计算(3x^2y-xy^2+1/2xy)/(-1/2xy)
计算3xy[2xy-x(y-2)+x-1]
计算:3xy[2xy-x(y-2)+x]
计算(3x^3y-x^2y+1/2xy)÷(-1/2xy)
xy(xy+1)+(xy+3)-2(x+y+2分之一)-(x+y-1)的平方
化简!1、(x^2-xy)+xy+y^2 2、3(x^2-xy)-xy+y^2
分解因式:(X+Y)*(X+Y+2XY)+(XY+1)*(XY-1)
计算 2xy[4x²y²-3y(xy+x²y)-xy²]
计算:(5-xy/x^3-x^2y)/(1-5/xy)^2*(y-x)^3
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
1.计算 (-x方+2xy-y方)-2(xy-3x方)+3(2y方-xy)
计算:(-7x²y)(2x²y-3xy³+xy)
1、已知x+y=-2,xy=3,求代数式2(x+xy)-[(xy-3y)-x]-(-xy)