2.(-$\frac{1}{3}$)-2的值为( )
| A. | -9 | B. | 9 | C. | -6 | D. | -$\frac{1}{9}$ |
20.下列说法正确的是( )
0 295595 295603 295609 295613 295619 295621 295625 295631 295633 295639 295645 295649 295651 295655 295661 295663 295669 295673 295675 295679 295681 295685 295687 295689 295690 295691 295693 295694 295695 295697 295699 295703 295705 295709 295711 295715 295721 295723 295729 295733 295735 295739 295745 295751 295753 295759 295763 295765 295771 295775 295781 295789 366461
| A. | 五个内角都相等的五边形为正五边形 | |
| B. | 四个内角都是直角的四边形为正四边形 | |
| C. | 六条边都相等的六边形是正六边形 | |
| D. | 每个内角都相等且每条边也相等 |