17.
如图,圆锥底面半径为rcm,母线长为10cm,其侧面展开图是圆心角为216°的扇形,则r的值为( )
| A. | 3 | B. | 6 | C. | 3π | D. | 6π |
16.一组数据:2,5,4,3,2的中位数是( )
| A. | 4 | B. | 3.2 | C. | 3 | D. | 2 |
15.不等式组$\left\{\begin{array}{l}{x-1>0}\\{x≤2}\end{array}\right.$的解集是( )
| A. | x≤2 | B. | x>1 | C. | 1<x≤2 | D. | 无解 |
14.(x2y)3的结果是( )
0 284088 284096 284102 284106 284112 284114 284118 284124 284126 284132 284138 284142 284144 284148 284154 284156 284162 284166 284168 284172 284174 284178 284180 284182 284183 284184 284186 284187 284188 284190 284192 284196 284198 284202 284204 284208 284214 284216 284222 284226 284228 284232 284238 284244 284246 284252 284256 284258 284264 284268 284274 284282 366461
| A. | x5y3 | B. | x6y | C. | 3x2y | D. | x6y3 |