13.根据下列条件,能唯一画出△ABC的是( )
| A. | AB=3,BC=4,∠A=30° | B. | ∠A=60°,∠B=45°,∠C=75° | ||
| C. | AB=2,BC=4,AC=5 | D. | ∠C=90°,AB=6 |
12.要使式子$\sqrt{x-4}$有意义,则x的取值范围是( )
| A. | x≥4 | B. | x≠4 | C. | x<4 | D. | x>4 |
11.下列各数中,无理数是( )
| A. | $\frac{22}{7}$ | B. | $\frac{{\sqrt{3}}}{2}$ | C. | 3.1415926 | D. | ($\frac{{\sqrt{3}}}{2}$)2 |
7.函数y=4x的图象不经过的点的坐标是( )
| A. | (0,0) | B. | (1,4) | C. | (1,-4) | D. | (-1,-4) |
6.下列关于$\sqrt{2}$的说法中,错误的是( )
| A. | $\sqrt{2}$是无理数 | B. | 1<$\sqrt{2}$<2 | ||
| C. | $\sqrt{2}$是2的算术平方根 | D. | 2的平方根是$\sqrt{2}$ |
5.3的算术平方根是( )
0 308705 308713 308719 308723 308729 308731 308735 308741 308743 308749 308755 308759 308761 308765 308771 308773 308779 308783 308785 308789 308791 308795 308797 308799 308800 308801 308803 308804 308805 308807 308809 308813 308815 308819 308821 308825 308831 308833 308839 308843 308845 308849 308855 308861 308863 308869 308873 308875 308881 308885 308891 308899 366461
| A. | 9 | B. | 3 | C. | ±$\sqrt{3}$ | D. | $\sqrt{3}$ |