Question

高二数学！高手来啊！

数列{an}，a1=3，an*a(n+1)=(1/2)^n，求an

Answer 1

a(2n+1)/a(2n-1)=1/2
a1=3
a1*a2=1/2
a2=1/6
n=2k-1 an = 3 * (1/2)^(k-1）
n=2k an = 1/6 * (1/2)^(k-1)