F(n+2)-F(n+1)=F(n)
F(n+1)-F(n)=F(n-1)
.
F(3)-F(2)=F(1)
全加上
F(1)+F(2)+F(3)+.F(n)=F(n+2)-F(2)=
=F(n)+F(n+1)-F(2)
=233+377-2
=608
F(n+2)-F(n+1)=F(n)
F(n+1)-F(n)=F(n-1)
.
F(3)-F(2)=F(1)
全加上
F(1)+F(2)+F(3)+.F(n)=F(n+2)-F(2)=
=F(n)+F(n+1)-F(2)
=233+377-2
=608