探究2：参数变化对双曲线的影响（3.1.2 P111 图3.1-10 a、c对双曲线开口的影响）

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  1. ★探究问题：当e越大时，双曲线的开口大小程度变化是否有规律，规律是什么？ 请在画板下面回答你的探究结论。 (.ggb)