7.
由五个相同的正方体搭成的几何体如图所示,则它的俯视图是( )
| A. | B. | C. | D. |
3.
如图,O是坐标原点,菱形OABC的顶点A的坐标为(-3,-4),顶点C在x轴的负半轴上,函数y=$\frac{k}{x}$(x<0)的图象经过菱形OABC中心E点,则k的值为( )
| A. | 6 | B. | 8 | C. | 10 | D. | 12 |
2.分式$\frac{|x|-2}{x-2}$的值为零,则x的值为( )
| A. | 0 | B. | 2 | C. | -2 | D. | 2或-2 |
18.若矩形的长和宽是方程x2-7x+12=0的两根,则矩形的对角线之和为( )
0 294602 294610 294616 294620 294626 294628 294632 294638 294640 294646 294652 294656 294658 294662 294668 294670 294676 294680 294682 294686 294688 294692 294694 294696 294697 294698 294700 294701 294702 294704 294706 294710 294712 294716 294718 294722 294728 294730 294736 294740 294742 294746 294752 294758 294760 294766 294770 294772 294778 294782 294788 294796 366461
| A. | 5 | B. | 7 | C. | 8 | D. | 10 |