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=?