Question

写出数列{an}的前五项

Answer 1

(1)

a1=1/2;

a2=4a1+1=3;

a3=4a2+1=13;

a4=4a3+1=53;

a5=4a4+1=213.

(2)

a1=-1/4;

a2=4a1+1=0;

a3=4a2+1=1;

a4=4a3+1=5;

a5=4a4+1=21.