09/07/01 19:30:26
>>79
簡単な計算により
F[2n] = 2 F[n+1] F[n] - F[n]^2
よって
F[2n] ≧ 2 F[n]^2 - F[n]^2 = F[n]^2
F[2n] ≦ F[n+1]^2 - (F[n-1] - F[n])^2 ≦ F[n+1]^2
09/07/01 19:30:26
>>79
簡単な計算により
F[2n] = 2 F[n+1] F[n] - F[n]^2
よって
F[2n] ≧ 2 F[n]^2 - F[n]^2 = F[n]^2
F[2n] ≦ F[n+1]^2 - (F[n-1] - F[n])^2 ≦ F[n+1]^2