设 n为自然数,且 an=3√n2+2n+1+3√n2-1+3√n2-2n+1, 则 1a1+1a3+1a5+⋯+1a997+1a999的值是( )
A. |
3 |
B. |
4 |
C. |
5 |
D. |
6 |
设 n为自然数,且 an=3√n2+2n+1+3√n2-1+3√n2-2n+1, 则 1a1+1a3+1a5+⋯+1a997+1a999的值是( )
A. |
3 |
B. |
4 |
C. |
5 |
D. |
6 |
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