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由題意:a=6,b=8,那麼c=根號(36+64)=10, 根據雙曲線的定義:某個點道兩焦點的距離之差為2a, 則有,p到另一焦點的距離為:9+2*6=21;F1F2=2c=20; 所以周長為C=9+21+20=50
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