Processing math: 100%

斐波拉契數列平方和性質

 斐波拉契數列 1,1,2,3,5,8,13,21,34,55,89,.......,fn其中第n項 fn = fn-1 + fn-2。

 

  12+12=1×2
   
  12+12+22=2×3
   
  12+12+22+32=3×5
   
  12+12+22+32+52=5×8

 

可以推廣得,12+12+22+32+52+82++f2n=fnfn+1

f1=f2=1f21=f1f2                                 

f2=f3f1f22=f3f2f1f2                           

f3=f4f2f23=f4f3f2f3                           

.........

fn=fn+1fn1f2n=fnfn+1fnfn1     

(1)

(2)

(3)

......

(n)


(1)+(2)+(3)+....+(n) 得 f21+f22+f23++f2n=fnfn+1

 

如果n=   (建議n小於51)

斐波拉契數列前n項平方和= 

 


Copyright ©昌爸工作坊 all rights reserved.