Y=(X^2 -2X+3)÷（X^2 -X+1) 求其值域 有那几种方法解题啊!这是分式

化简3x-2/(x+y)[(x+y)/3x-x-y]÷(x-y)/x 3^x+2x=y,x x-y/x-x+y/y-(x+y)(x-y)/y² y/x=2 x(x-y)2-(y-x)3 [2/3x-2/x+y(x+y/3x-x-y)]/x-y/x 化简：{2/3x-2/(x+y)[(x+y)/3x-x-y]}/(x+y)/x 计算2/3x-2/x+y(x+y/3x-x-y)/x-y/x x²/xy-x/y 3x/4x+y - x-2y/4x+y (1-y/y+x)÷x/y²-x² (x-y) (x-2y)+(x+2y) (x-3y)-2(x-3y) (x-4y)= (x+y)(x-y)+(x-y)平方-(x-y)(3x-y) 其中x=-2 y=3分之一 已知x-y/x+y=3,求代数式5(x-y)/x+y-x+y/2(x-y) (x+y)(2x-3y)=? 化简后求值 [(x-2y)²+(x-2y)(x-2y)-2x(2x-y)]÷2x 其中x=2 y=3 先化简,后求值:[(x-y)²+(x+y)(x-y)]÷2x,其中x=3,y=1.5 已知x-y=1,求[(x+2y)²+(2x+y)(x-4y)-3(x+y)(x-y)]÷y的值 函数,y=3x/(x^2+x+1) ,x 函数y=3x/(x^2+x+1) （x (x+y)-(x-y)^3÷(x-y)(x+y)×2y化简e ,