题目内容
我们把离心率为
的双曲线
称为黄金双曲线.如图(图2)给出以下几个说法:
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①双曲线
是黄金双曲线; ②若
,则该双曲线是黄金双曲线;
③若
,则该双曲线是黄金双曲线;④若
,则该双曲线是黄金双曲线.其中正确的是
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①双曲线
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③若
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A.①② | B.①③ | C.①③④ | D.①②③④ |
D
双曲线
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① 正确;若
,则
即
.②正确;若
,则
即
,
.③正确;若
,则
整理得
,
.④正确
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① 正确;若
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