14.计算a5•(-$\frac{1}{a}$)2的结果是( )
0 282553 282561 282567 282571 282577 282579 282583 282589 282591 282597 282603 282607 282609 282613 282619 282621 282627 282631 282633 282637 282639 282643 282645 282647 282648 282649 282651 282652 282653 282655 282657 282661 282663 282667 282669 282673 282679 282681 282687 282691 282693 282697 282703 282709 282711 282717 282721 282723 282729 282733 282739 282747 366461
| A. | -a3 | B. | a3 | C. | a7 | D. | a10 |