[考古] 高師大的考古 明天要考了 請大家幫我解惑吧

[s9321312 (小凱)]

   1. Find the volume of a ball of radius r by any method in Calculus



             |2x|
   2.lim   -------- = ?
     x->0       x


                           ∞
   3.If |x|< 1，then find  Σ  (n+1)(n+2)x^n = ?
                           n=0




                                      thanks a lot !!


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