7.掷一枚质地均匀的正方体骰子,骰子的六个面上分别标有1、2、3、4、5、6的点数,掷得面朝上的点数为奇数的概率为( )
| A. | $\frac{1}{6}$ | B. | $\frac{1}{3}$ | C. | $\frac{1}{4}$ | D. | $\frac{1}{2}$ |
6.
如图,在平面直角坐标系中,∠AOB=90°,∠OAB=30°,反比例函数y1=$\frac{3\sqrt{3}}{x}$的图象经过点A,反比例函数y2=$\frac{n}{x}$(n<0)的图象经过点B,则n的值是( )
| A. | -3 | B. | -$\sqrt{3}$ | C. | -$\frac{\sqrt{3}}{3}$ | D. | -$\frac{1}{3}$ |
3.若实数x,y满足|x-4|+$\sqrt{y-8}$=0,则以x,y的值为边长的等腰三角形的周长为( )
| A. | 20 | B. | 16 | C. | 20或16 | D. | 12 |
2.
如图,所有正方形的中心均在坐标原点,且各边与x轴或y轴平行.从内到外,它们的边长依次为2,4,6,8,…,顶点依次用A1,A2,A3,A4,…表示,则顶点A2014的坐标是( )
| A. | (-503,503) | B. | (-504,504) | C. | (503,-504) | D. | D、(504,-504) |
1.下列语句中正确的是( )
| A. | 36的算术平方根是±6 | B. | -36的算术平方根是6 | ||
| C. | 36的平方根是-6 | D. | 36的算术平方报是6 |
20.在六张卡片上分别写有:π,$\frac{1}{3}$,1.5,-3,0,$\sqrt{2}$六个数,从中任意抽取一张,卡片上的数为有理数的概率是( )
0 286670 286678 286684 286688 286694 286696 286700 286706 286708 286714 286720 286724 286726 286730 286736 286738 286744 286748 286750 286754 286756 286760 286762 286764 286765 286766 286768 286769 286770 286772 286774 286778 286780 286784 286786 286790 286796 286798 286804 286808 286810 286814 286820 286826 286828 286834 286838 286840 286846 286850 286856 286864 366461
| A. | $\frac{1}{6}$ | B. | $\frac{1}{3}$ | C. | $\frac{1}{2}$ | D. | $\frac{2}{3}$ |