18.
在平面直角坐标系中,正方形OABC的面积为16,反比例函数图象的一个分支经过该正方形的对角线交点,则反比例函数的解析式为( )
| A. | y=$\frac{4}{x}$ | B. | y=-$\frac{4}{x}$ | C. | y=$\frac{16}{x}$ | D. | y=-$\frac{16}{x}$ |
15.计算x÷x3的结果是( )
| A. | $\frac{1}{{x}^{2}}$ | B. | $\frac{1}{{x}^{4}}$ | C. | x2 | D. | x4 |
14.点A(-5,4),B在平面直角坐标系中,且AB∥y轴,若△ABO的面积为5,则点B的坐标为( )
| A. | (-5,2) | B. | (-5,6) | C. | (-5,-6) | D. | (-5,6)或(-5,2) |
13.大于$\sqrt{2}$且小于$\sqrt{5}$的整数是( )
0 285979 285987 285993 285997 286003 286005 286009 286015 286017 286023 286029 286033 286035 286039 286045 286047 286053 286057 286059 286063 286065 286069 286071 286073 286074 286075 286077 286078 286079 286081 286083 286087 286089 286093 286095 286099 286105 286107 286113 286117 286119 286123 286129 286135 286137 286143 286147 286149 286155 286159 286165 286173 366461
| A. | 1 | B. | 2 | C. | 3 | D. | 4 |