D(k +1) = - D(k) / (k +2) =D(k-1)/(k+1)(k+2)= - D(k-2)/k(k+1)(k+

=(-1)^k*D(1)/(3*4*...(k+2)=(-1)^k/2*3*4*...(k+2)=(-1)^k/(k+2)!=(-1)^(k+2)/(k+2)!

Brother's proof is very good, I only explain in detal.

所有跟帖： 

• "当m = 1，根据（1）和（2），D(1) = T(2) - T(1) = 1/2 = (-1)^2 / 2! " -wxcfan123- ♂ (156 bytes) () 10/13/2011 postreply 18:04:26

• 回复："当m = 1，根据（1）和（2），D(1) = T(2) - T(1) = 1/2 = (-1)^2 / 2! " -jinjing- ♀ (254 bytes) () 10/13/2011 postreply 18:58:29

• b=2a,T(1)=T(2)=...T(i)=...=1should be a=2b,T(1)=T(2)=...T(i)=... -jinjing- ♀ (38 bytes) () 10/14/2011 postreply 06:52:06