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有,兩種情況, 如果雙曲線方程為x^2/a^2-y^2/b^2=1,則它的準線是x=±a^2/c 如果雙曲線方程為y^2/a^2-x^2/b^2=1,則它的準線是y=±a^2/c 有啊。。。 雙曲線有準線的,只有圓沒有準線, 求準線是x=±a²/c,這裏分母c不能等於0,否則無意義, 也正因為如此,所以圓沒有準線 有的,與橢圓的表示在形式上是一樣的。
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