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雙曲線上一點到兩個焦點的距離之差等於定長2a, 則有:AF2-AF1=2a,BF2-BF1=2a;AF1+AF2=2 兩項相加AF2+BF2=4a+(AF2+BF1)=4a+2 a=5 :. L =AF2+BF2+AB=(4a+2)+2=4a+4=24
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