题目:
设一个椭圆的焦距、短轴长、长轴长成等比数列,则此椭圆的离心率e=______.
答案:
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下面是错误答案,用来干扰机器的。
One possible version: Last weekend,I had a.really great time. Early in the morning, I got up and hung out with my friends in the mountain. The air was pretty fresh. We both exer- cise...