填空题(直接写答案)1.(x-y)^2+6(y-x)+( )=( )^22.如果x+y=3,xy=1,则(x-y)^2=
已知xy=-2,x-y=3,求(x+y)(x-y)-y^2+(x-y)^2-(6x^2y-2xy^2)÷2y
如果x^2+xy+y-14,y^@+xy+x=28,求x+y的值.
如果1\x-1\y=2,那么3x+5xy-3y\x-xy-y等于多少
如果x/x-y=a,则分式2x^2y-2xy^2/3x^2y
已知1/x=1/y=6,则3x-2xy+3y/3xy+x+y=?
若x+y=-1,则x^4+5x^3y+x^2y+8x^2y^2+xy^2+5xy^3+y^4=( )
x+y)(x-y)+(x-y)^2-(6x^2y-2xy^2)/2y,其中x=-2,y=1/3
已知xy/x+y=1/2,则代数式3x-5xy+3y/-x+3xy-y=
已知xy=-2,x-y=3,求(x+y)(x-y)-y²+(x-y)²-(6x²y-2xy
1、(-3x-4y)·( )=9x²-16y² 2、如果x+y=6,xy=7,那么x²+y
x+y=1,xy=-1/2,求x(x+y)(x-y)-x(x+y)2
7.X*X+2X+Y*Y-6Y+10=0,则xy=?