共50条信息
椭圆\(\dfrac{x^{2}}{16}{+}\dfrac{y^{2}}{4}{=}1\)的左右焦点分别为\(F_{1}{,}F_{2}\),\(P\)为其上一点,\(\left| PF_{1} \right|{-}\left| PF_{2} \right|{=}2\),则\(\left| PF_{2} \right|=(\) \()\).
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