(x-1)/(x^2-5x+6)+(x-2)/(x^2-4x+3)+(x-3)/(x^2-3x+2)还有一道:(1-4x)^2/2x+3*(4x^2+12x+9)/(4x-1)(1-4x)^2/(2x+3)*(4x^2+12x+9)/(4x-1)第二题应该是这样的、不好意思、要有过程!

问题描述:

(x-1)/(x^2-5x+6)+(x-2)/(x^2-4x+3)+(x-3)/(x^2-3x+2)
还有一道:(1-4x)^2/2x+3*(4x^2+12x+9)/(4x-1)
(1-4x)^2/(2x+3)*(4x^2+12x+9)/(4x-1)
第二题应该是这样的、不好意思、要有过程!

一、(x-1)/(x^2-5x+6)+(x-2)/(x^2-4x+3)+(x-3)/(x^2-3x+2) =(x-1)/【(x-2)(x-3)】+(x-2)/【(x-1)(x-3)】+(x-3)/【(x-1)(x-2)】=[(x-1)^2+(x-2)^2+(x-3)^2/【(x-1)(x-2)(x-3)】=[(x-1)^2+(x-2)^2+(x-3)^2/【(x-1)(x-2)(x-3)】=(3x^2-12x+14)/【(x-1)(x-2)(x-3)】
二、(1-4x)^2/(2x+3)*(4x^2+12x+9)/(4x-1)=-(1-4x)*(2x+3)

(x-1)/(x^2-5x+6)+(x-2)/(x^2-4x+3)+(x-3)/(x^2-3x+2) = (x-1)/{(x-2)(x-3)} + (x-2)/{x-1)(x-3)} + (x-3)/{(x-1)(x-2)}= { (x-1)^2 + (x-2)^2 + (x-3)^2 } / { (x-1)(x-2)(x-3) }= (x^2-2x+1+x^2-4x+4+x^2-6x+9) / ...