18.计算-3+|-5|的结果是( )
| A. | -2 | B. | 2 | C. | -8 | D. | 8 |
15.已知(3-2a)x+2=0是关于x的一元一次方程,则|a-$\frac{3}{2}$|一定( )
| A. | 大于0 | B. | 小于0 | C. | 等于0 | D. | 不确定 |
12.方程kx2-x-1=0是关于x的一元二次方程,则k的取值范围是( )
| A. | k>-1 | B. | k≠-1 | C. | k<-1 | D. | k≠0 |
9.如果a>b,那么下列不等式中正确的是( )
0 284584 284592 284598 284602 284608 284610 284614 284620 284622 284628 284634 284638 284640 284644 284650 284652 284658 284662 284664 284668 284670 284674 284676 284678 284679 284680 284682 284683 284684 284686 284688 284692 284694 284698 284700 284704 284710 284712 284718 284722 284724 284728 284734 284740 284742 284748 284752 284754 284760 284764 284770 284778 366461
| A. | a-b<0 | B. | a+3<b-3 | C. | ac2>bc2 | D. | 3-a<3-b |