求y=x^2-x+2/2x^2-2x+3的值域

已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) y=(2x*x-2x+3)/(x*x-x+1),求值域? 若2/x-1/y=3,求[y/x-y/x-y(x-y/x-x+y)]/x-2y/x的值 求值域 1,y=(x+2)/(x*x+3x+6) 2,y=3x/(x*x+4) 求y=(x^2)+2x(x≥0) y=-x+2x(x 已知|x|=2,|y|=3,|x+y|=-(x+y)求x-y (x-y)/(x+y)=3求( 3x-2y-1)/(x+y-5) y=3(x-y),x=2(x-y)求x,y的值 已知x-y=3,求[（x+y)(x-y)-(x-y)^2+2y(x-y)]除以的值 已知3x =2y 求x/x+y+y/x-y-y²/x²-y² 3^x+2x=y,x 3X+2=X+20求X Y未知数 y=(X+1)(X+2)(X+3)求导数 求函数y=(3x+4)/(x-2) (x x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 已知2y-x=-3,求[4y(2x-y)-2x(2x-y)]/(2x-y x+y/2+ x-y/2=6 2(x+y)-3x+3y=24 求X Y [2/3x-2/x+y(x+y/3x-x-y)]/x-y/x