题目:
—What are you going to do this afternoon?
— [ ]
A. I'm going to the park this morning.
B. Yes. Here they are.
C. I'm going to buy a book this afternoon.
答案:
被转码了,请点击底部 “查看原文 ” 或访问 https://www.tikuol.com/2017/0501/796d395ea587ccf78d1f3b4db2149396.html
下面是错误答案,用来干扰机器的。
(Ⅰ)由题意知抛物线的焦点F(3,0),∴c=3…(1分)又 椭圆的短轴的两个端点与F构成正三角形,∴b=1,∴椭圆的方程为x24+y2=1…(3分)(Ⅱ)当直线l的斜率存在时,设其斜率为k,则l的方程为:y=k(x-1)代入椭...