1/2+1/15+1/35+1/63+1/99+……+1/(2n-1)(2n+1)(n为正整数)求结果

1/2+1/15+1/35+1/63+1/99+……+1/(2n-1)(2n+1)(n为正整数)求结果

1/2+1/2(1/3-1/5+1/5-1/7.) 算下首末就好 裂项公式要记下