等差数列{1/an}中,a4=6,a6=4,则a10=?那个数列是an分之1，成等差，有4个备选答案，A.5/12B-99/10C12/5D2

Question

等差数列{1/an}中,a4=6,a6=4,则a10=?
那个数列是an分之1，成等差，有4个备选答案，A.5/12 B-99/10 C12/5 D2

Answer 1

1/a4=1/6,1/a6=1/4,偶数项公差是1/12
所以1/a10=1/a6+2d=1/4+1/6=5/12
a10=12/5
选c