1.若x的算术平方根为8,则它的立方根是( )
| A. | 2 | B. | -2 | C. | 4 | D. | ±4 |
19.近似数1.30是由数x四舍五入得到的数,则数x的取值范围是( )
0 284538 284546 284552 284556 284562 284564 284568 284574 284576 284582 284588 284592 284594 284598 284604 284606 284612 284616 284618 284622 284624 284628 284630 284632 284633 284634 284636 284637 284638 284640 284642 284646 284648 284652 284654 284658 284664 284666 284672 284676 284678 284682 284688 284694 284696 284702 284706 284708 284714 284718 284724 284732 366461
| A. | 1.25≤x<1.35 | B. | 1.295≤x<1.305 | C. | 1.25<x<1.35 | D. | 1.295<x<1.305 |