本题的解题关键是看到 x^2-1 =（x=1）（x-1）6 1-x 2x-5------- = ----- + --------x^2-1 1-x 1-x6 1-x+2x-5 即 -------- = -------------------x^2-1 1-x6 x-4 --------- --- = -------------------(x+1)(x-1) 1-x6...