x+y=2,x+Y^2=4,则X^2007+Y^2007=

x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 已知x*x+4x+y*y-2y+5=0,则x*x+y*y=? (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= (x-4y)(2x+y)= 若x,y,z成等差数列,则(z-x)^2-4(x-y)(y-x)= 4x方y/(x-2y)(x+2y)怎么算[x方/x-2y]-4x方y/(x-2y)(x+2y)=? 2x-y/x+y=4,则4x-2y/2x+2y+3x+3y/2x-y 若x+y=4,则多项式1/2(x+y)+4(x-y)-3（x-y）-3/2(x+y)-x+y值是（） (x+y)^2(x-y)^2(x^4+x^2y^2+y^4)=? 设f(x+y,x-y)=x^2-y^2,则f(x,y)= 若f(x+y,y/x)=x^2-y^2,则F(X,Y)= 已知f(x+y,y/x)=x^2-y^2,则f(x,y)= 3(x+y)+2(x-y)=36 4(x+y)-5(x-y)=2 （x+y）/2- x-y/2=6 3(x+y)=4(x-y) x+y/3+x-y/2=6 4(x+y)-2(x-y)=40 x*x+2x+y*y-4y+5=0 x= y= 如果|X|=4 |Y|=2 且|X+Y|=X+Y 求X+Y {3(x+y)-4(x-y)=4 {x+y/2 + x-y/6=1