对应m=,-,-1的二项展开式分别为 24+2 1 3 1+x=1+2x x3- 1.3.5 x4+. .4.6246 (-1≤x≤1) 323+3 x+ X 4-. 2.462.46.8 (-1<x≤1) 1=1-x+x2-x3++(-10”x”+. 1+ (-1<x<1) 1 =1+x+x2++x”+.(-1<x<1)对应 , , 1 2 1 2 1 m = − − 的二项展开式分别为 x x 2 1 1+ =1+ 2 2 4 1 x  − 3 2 4 6 1 3 x    + (−1 x 1) +      − 4 2 4 6 8 1 3 5 x 1 1 1 = + x 2 2 4 1 3 x   + 3 2 4 6 1 3 5 x     − (−1 x 1) −       + 4 2 4 6 8 1 3 5 7 x x 2 1 − 1 1 1 = + x 2 + x 3 − x (−1 x 1) − x ++ (−1) n x n + 1 ( 1 1) 1 1 2 = + + + + + −   − x x x x x  n 