在数列{an}中,a1=1/3,an=(-1)^2 an-1(N大于等于2)则a5

问题描述:

在数列{an}中,a1=1/3,an=(-1)^2 an-1(N大于等于2)则a5

a{1} = 1/3
a{2} = (-1)^(2/3) = 1^(1/3) = 1
a{3} = (-1)^2 = 1
a{5} = a{4} = a{3} = a{2} = 1