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兩個焦點為F1、F2,根據雙曲線定義可知 “||PF1|-|PF2||=8,即:|12-|PF2||=8, 當P在雙曲線右支上時,|PF1|=12,|PF2|=12-8=4; 當P在雙曲線左支上時,|PF1|=12,|PF2|=12+8=20.”
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