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雙曲線2x的平方-3y的平方=18 即x²;/9-y²;/6=1 ∴a²;=9,b²;=6 ∴c²;=9+6=15 即a=3,c=√15 利用雙曲線的定義, 雙曲線上一點到兩焦點的距離之差的絕對值是2a=6 焦距是2c=2√15
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