计算3x+2/x^2-5x+6-2x+3/x^2-5x6+x-3/x^2-5x+6

(3x+2)/(x²-5x+6)-(2x+3)/(x²-5x6)+(x-3)/(x²-5x+6) =(3x+2-2x-3+x-3)/(x²-5x+6) =(2x-4)/(x²-5x+6) =【2(x-2)】/【(x-2)(x-3)】 =2/(x-3)