TuanDung

Xin chao cac Cao Nhan!

Em dang gap phai mot bai toan khong biet giai the nao. Cao nhan nao co y tuong gi xin giup em voi!
Bai Toan: Cho day so voi tinh chat sau:
F0=1
F1=2
F2=4
Fn=Fn-1+Fn-2+Fn-3 (voi n>=3)
Yeu cau: Tim cong thuc tong quat cua phan tu thu n(Fn).