.样本数据16,24,14,10,20,30,12,14,40的中位数为.14B.16C.18D.20【答案】B【解析】10,12,14,14,16,20,24,30,40,中位数16X椭圆。+y=a>1)的离心率为2,则a=.a2V5B.2c.v3D.23【答案】A