(-4xy^3)×(-xy)+(-3xy^2)^2
3xy-3xy-xy+2yx
计算:3xy[2xy-x(y-2)+x]
化简!1、(x^2-xy)+xy+y^2 2、3(x^2-xy)-xy+y^2
【(2+xy)(xy-2)-xy(xy+1)+4】/(-2xy) 一道计算题!
先化简,再求值 ⒈2(Xy+Xy)-3(Xy-xy)-4Xy,其中X=1,y=-1
3(xy-xy)-2(xy+xy)+3xy
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
3(x的2次方y+xy)-4(xy-2x的2次方y)-(-xy)化简
已知x+y=4,xy=-2,求代数式3(xy+2y)-(xy-6x)
3x²y+xy²-[2xy²-4x²y+(x²y-2xy²)
计算 2xy[4x²y²-3y(xy+x²y)-xy²]