16.下列结论正确的是( )
| A. | x2-2是二次二项式 | |
| B. | 单项式-x2的系数是1 | |
| C. | 使式子$\sqrt{x+2}$有意义的x的取值范围是x>-2 | |
| D. | 若分式$\frac{{a}^{2}-1}{a+1}$的值等于0,则a=±1 |
11.“这三个数-7,12,-2的代数和”与“它们的绝对值的和”的差为( )
0 284561 284569 284575 284579 284585 284587 284591 284597 284599 284605 284611 284615 284617 284621 284627 284629 284635 284639 284641 284645 284647 284651 284653 284655 284656 284657 284659 284660 284661 284663 284665 284669 284671 284675 284677 284681 284687 284689 284695 284699 284701 284705 284711 284717 284719 284725 284729 284731 284737 284741 284747 284755 366461
| A. | -18 | B. | -6 | C. | 6 | D. | 18 |