5.在$\frac{1}{2}$,0,-1,$\sqrt{2}$这四个实数中,最大的是( )
| A. | $\frac{1}{2}$ | B. | 0 | C. | -1 | D. | $\sqrt{2}$ |
4.下列式子为最简二次根式的是( )
0 279603 279611 279617 279621 279627 279629 279633 279639 279641 279647 279653 279657 279659 279663 279669 279671 279677 279681 279683 279687 279689 279693 279695 279697 279698 279699 279701 279702 279703 279705 279707 279711 279713 279717 279719 279723 279729 279731 279737 279741 279743 279747 279753 279759 279761 279767 279771 279773 279779 279783 279789 279797 366461
| A. | $\sqrt{2}$ | B. | $\sqrt{8}$ | C. | $\sqrt{9}$ | D. | $\sqrt{\frac{1}{3}}$ |