数学之美团为你解答(x²-3x+2) / (x²-5x+6) ÷ (x²-5x+4) / (x²-7x+12)= (x-1)(x-2) / [(x-2)(x-3)] ÷ (x-1)(x-4) / [(x-3)(x-4)]= (x-1)/(x-3) ÷ (x-1)/(x-3)= 1