如果数列An满足A1=3,1/An+1-1/An=5(n∈正整数）,求An谢谢了,大写A其实是a

Question

如果数列An满足A1=3,1/An+1-1/An=5(n∈正整数）,求An谢谢了,
大写A其实是a

Answer 1

1/An是等差数列,公差为5,首项为1/3 所以1/An=1/3+5(n-1)=(15n-14)/3 An=3/(15n-14)