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在椭圆中,F1,F2分别是其左右焦点,若|PF1|=2|PF2|,则该椭圆离心率的取值范围...
试题详情
在椭圆
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAIEAAAAxCAYAAAD9asolAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAABItJREFU
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z9UbT1CH4bz2ddGuQn226yDDi0su2QTFCaqS4Ny3az9vPI5NEWHdL/vnEEhccocmJbwzzB2c+7WS
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JgnOfb02uq2BnzyXXFJ0hAh7JYFW1OrdwHHtRC6BS64QnZEvs0oCsy00OQL3Wf2WcWQWXHJH5iS9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)
中,F
1,F
2分别是其左右焦点,若|PF
1|=2|PF
2|,则该椭圆离心率的取值范围是( )
A.
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAAAjCAYAAADizJiTAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAWdJREFU
WEftllsSxBAQRc2WbcdOrMMqbMJoeSBIt0kwqqjKzA/J6ce97WPsYjMsAJ1hsRkgXdVvQbU0nHEj
9fhwyqBKQO/a599BXRKVEQu0rp0QMa2M1qUTVf3q0eqEXnwULEmo4C1jelSJ1BK9mACSS3N6uzN7
8NHtifjrE5I/URwo2kgef3MDhQMh5Fsgd+9BB0pcTQeqRKOMoQEjrRW0ogWFzcL+jlgIqGuNjY3Z
dMa92ZUXE6vvVaYlT0APAeX+342DBsrt9S0LSoE5gqDsLe+pAP219D1BwRp3Mf125wTYZwvLqBd6
2Z5Cw8+4/WNIykCJ7Wk3/MiibCTnAICoRvgsKN5XOj9CtfajdMhAKI3Qo9GgHNcyJxeVZ11JOZ2b
lLdqgANO3U1uJBRkvweX7d70YLojFw7qtJZOr97QJFA3FAaXnwCaKrB3NuF7edDzUtvwdl8ZLSGj
lW9stH2Bvp3YaTL6BRVJZF6gMPyPAAAAAElFTkSuQmCC
)
B.
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAAAjCAYAAADizJiTAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAWFJREFU
WEftmO0RgyAMhunKrMMmzMEULEEJIEhFk0gt2oM7r38CPnnJl305v8QTFoA+YYknQIZbPwS12kkh
nbbj3dkHNQpi1z93Bw0iGqcmKC+ckGSaivLkRLN+xihbUKij1mkJZSg+siqaY2LUqG1JzKA1oPc4
FPvigDJ8FdAduw0lird+5z4o+pZOA7Sh1Lc5DpTSUMCZJOu9QUNoKF97wlAS42ETo503S9uOJWuJ
1SboUgFavzQAqhUNFEQ8rejiBBWpbfdnoJBPpxVN31p9gqItGhTHkmld8BvVHq6+a1EaCl6evCdS
+3qwDM91l+gCJG+GjC+ttH311ibIeKpRvwY9aKHtoSRQ5u5AFqPTsCXMYaDBhuDAJRMJzxs8I1LQ
j+lcxRkcNEx80omcXDwlvmVNAh0Rp58OEkC3GfgtlTjntEHzUBuT6Qa5hPz3xHH5YlvC1V9MQDx+
ghKFIpu9AU+NUUQrllk2AAAAAElFTkSuQmCC
)
C.
![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAAAjCAYAAADizJiTAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
D.
相关试题
-
在椭圆
中,F1,F2分别是其左右焦点,若|PF1|=2|PF2|,则该椭圆离心率的取值范围是( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAAAjCAYAAADizJiTAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAWdJREFU
WEftllsSxBAQRc2WbcdOrMMqbMJoeSBIt0kwqqjKzA/J6ce97WPsYjMsAJ1hsRkgXdVvQbU0nHEj
9fhwyqBKQO/a599BXRKVEQu0rp0QMa2M1qUTVf3q0eqEXnwULEmo4C1jelSJ1BK9mACSS3N6uzN7
8NHtifjrE5I/URwo2kgef3MDhQMh5Fsgd+9BB0pcTQeqRKOMoQEjrRW0ogWFzcL+jlgIqGuNjY3Z
dMa92ZUXE6vvVaYlT0APAeX+342DBsrt9S0LSoE5gqDsLe+pAP219D1BwRp3Mf125wTYZwvLqBd6
2Z5Cw8+4/WNIykCJ7Wk3/MiibCTnAICoRvgsKN5XOj9CtfajdMhAKI3Qo9GgHNcyJxeVZ11JOZ2b
lLdqgANO3U1uJBRkvweX7d70YLojFw7qtJZOr97QJFA3FAaXnwCaKrB3NuF7edDzUtvwdl8ZLSGj
lW9stH2Bvp3YaTL6BRVJZF6gMPyPAAAAAElFTkSuQmCC
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAAAjCAYAAADizJiTAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAWFJREFU
WEftmO0RgyAMhunKrMMmzMEULEEJIEhFk0gt2oM7r38CPnnJl305v8QTFoA+YYknQIZbPwS12kkh
nbbj3dkHNQpi1z93Bw0iGqcmKC+ckGSaivLkRLN+xihbUKij1mkJZSg+siqaY2LUqG1JzKA1oPc4
FPvigDJ8FdAduw0lird+5z4o+pZOA7Sh1Lc5DpTSUMCZJOu9QUNoKF97wlAS42ETo503S9uOJWuJ
1SboUgFavzQAqhUNFEQ8rejiBBWpbfdnoJBPpxVN31p9gqItGhTHkmld8BvVHq6+a1EaCl6evCdS
+3qwDM91l+gCJG+GjC+ttH311ibIeKpRvwY9aKHtoSRQ5u5AFqPTsCXMYaDBhuDAJRMJzxs8I1LQ
j+lcxRkcNEx80omcXDwlvmVNAh0Rp58OEkC3GfgtlTjntEHzUBuT6Qa5hPz3xHH5YlvC1V9MQDx+
ghKFIpu9AU+NUUQrllk2AAAAAElFTkSuQmCC
)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAAAjCAYAAADizJiTAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
D.
-
在椭圆
中,F1,F2分别是其左右焦点,若|PF1|=2|PF2|,则该椭圆离心率的取值范围是( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAAAjCAYAAADizJiTAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAFjSURBVFhH7ZZhEsQQDIWdzJ1cx2UcxVGs0BaL
Rlpqu8NMd//QfnmSlzDzksVewmn+BFRLwxk3Us/Xva6oEoYxZp9fB3UiKiMWKC2dkGJaitLktLuX
omTJkAOpomBJQkVH5uSoErklBlCA5NIc3u7MHnzUPwl/L7mqDUUbydNvelA4EEP2Ajl7D9pQ0tt0
oEoMUgwNGEmtKBUtKGwW9nfGQkBdang2ZuVMc/NRXqxYQ64yLXkGuhdQ6b9vHG2g3I5vRVAqzB4Q
9Rw+9HhFHWiPqx8NCta4FdP9mRNg6Qu7+lDodXuKDR9x+0uQLQ0ltafN8BOLspEcDQCiqvvsJcgm
6SE/w02XW6jWoZVOaQi1FrpHCNfxfc3ZoNIkx61NpU55WgFwwFX0kImEFgteqlvSg5fNXDioq7W8
ez0N3QTqmsLk628AzSvwaTXhe2XQY6gdON0To21QlPjGQdsXaG9hX6PoByvk4LFetvHdAAAAAElF
TkSuQmCC
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAAAjCAYAAADizJiTAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAFcSURBVFhH7ZftDYQgDIaZjJ1Yh2UYhVF6BVTk
RNsaCGowMffj+Hj60r5FBS951Es44SOg3oJWGqwfr/u5os6AUgrfp4NGER2YCSpLJ6KYpqIyOXH0
VFQsGTEBFfVgdbCh9OrCNMfkqDNHS9xAS0AML5p9DsC41hqte9R8Oom33/MctANXsSTZUMrTHAfK
aSghmEXWZ4PG9DPYH6M9pXw45Gjvo+courAFUaugqwPUftvyU66SRWyi6BqQPIiPgZ4evVwZzCH0
XPlDKRr+p4ppb/iE29+C5DQU2p4wEm2x5tbLc9kl9srdgmRJHwopd616MXm/QKYVnTkHZe0pHnTR
QuuXkki5dQfxfjcn1IS5rIAwIQbQ5UYii4Iu1SXpx3SuHAwNGm9jGtRWXDIlWo1mgY7I0/8AGaDH
CmylkmSdOuh2qU3F9IBaor5CJTH3Hcs4+r4A3NUnKFcp7rgfZN/Lt4BsewgAAAAASUVORK5CYII=
)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAAAjCAYAAADizJiTAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAAF/SURBVFhH7ZgBDoMgDEU5GXfiOlyGo3CUjgKK
2KIlw6GLJm7JVvXl9/NLVPCQQz2EE15QUae8Ba00WH9ePU9RZ0ApFc67g0YRHZgX9NxOHRWvoh1i
iUr/XlGMDONEWowp4hV1hkZWyVGE1Bbq7PVgNWZdOMl/X6LGsM/3Dt+1Pum5298SKF7EgDijQOex
4a2eqnYERSDa8X1b5Mb/Uuty+caKARQBTPjcHcQKtB3DgFo3ivZIbCrIyfovtrqyQwJdrHA5ZPLk
6lVFgRLClaBpM8KftQBFnCYoVfq49cuDxyq9AW21PiZB5d3jxXQlKC70vJj4PWFvPCHs2KMs9IN4
KmaWBH435DbwW9Owjqcc+FxECeXphsRIXBMFVeNyHP1ZOn0yQoWkvWXeV6OaDpzWCF0ehO346aYk
jkUymrlJOdr9XdoiUPS/QJypoHmyxF3U2cSbD8pOQdqYW4ByPt2j3gBUtiubA7q+JUmLSbCW3pdk
XTElKZ7TegnZruYxoB/C0si+vGxrqAAAAABJRU5ErkJggg==
)
D.
-
在椭圆
中,F1,F2分别是其左右焦点,若|PF1|=2|PF2|,则该椭圆离心率的取值范围是( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAAAjCAYAAADizJiTAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAWdJREFU
WEftllsSxBAQRc2WbcdOrMMqbMJoeSBIt0kwqqjKzA/J6ce97WPsYjMsAJ1hsRkgXdVvQbU0nHEj
9fhwyqBKQO/a599BXRKVEQu0rp0QMa2M1qUTVf3q0eqEXnwULEmo4C1jelSJ1BK9mACSS3N6uzN7
8NHtifjrE5I/URwo2kgef3MDhQMh5Fsgd+9BB0pcTQeqRKOMoQEjrRW0ogWFzcL+jlgIqGuNjY3Z
dMa92ZUXE6vvVaYlT0APAeX+342DBsrt9S0LSoE5gqDsLe+pAP219D1BwRp3Mf125wTYZwvLqBd6
2Z5Cw8+4/WNIykCJ7Wk3/MiibCTnAICoRvgsKN5XOj9CtfajdMhAKI3Qo9GgHNcyJxeVZ11JOZ2b
lLdqgANO3U1uJBRkvweX7d70YLojFw7qtJZOr97QJFA3FAaXnwCaKrB3NuF7edDzUtvwdl8ZLSGj
lW9stH2Bvp3YaTL6BRVJZF6gMPyPAAAAAElFTkSuQmCC
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAAAjCAYAAADizJiTAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAWFJREFU
WEftmO0RgyAMhunKrMMmzMEULEEJIEhFk0gt2oM7r38CPnnJl305v8QTFoA+YYknQIZbPwS12kkh
nbbj3dkHNQpi1z93Bw0iGqcmKC+ckGSaivLkRLN+xihbUKij1mkJZSg+siqaY2LUqG1JzKA1oPc4
FPvigDJ8FdAduw0lird+5z4o+pZOA7Sh1Lc5DpTSUMCZJOu9QUNoKF97wlAS42ETo503S9uOJWuJ
1SboUgFavzQAqhUNFEQ8rejiBBWpbfdnoJBPpxVN31p9gqItGhTHkmld8BvVHq6+a1EaCl6evCdS
+3qwDM91l+gCJG+GjC+ttH311ibIeKpRvwY9aKHtoSRQ5u5AFqPTsCXMYaDBhuDAJRMJzxs8I1LQ
j+lcxRkcNEx80omcXDwlvmVNAh0Rp58OEkC3GfgtlTjntEHzUBuT6Qa5hPz3xHH5YlvC1V9MQDx+
ghKFIpu9AU+NUUQrllk2AAAAAElFTkSuQmCC
)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAAAjCAYAAADizJiTAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
D.
-
在椭圆
中,F1,F2分别是其左右焦点,若|PF1|=2|PF2|,则该椭圆离心率的取值范围是( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAAAjCAYAAADizJiTAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAWdJREFU
WEftllsSxBAQRc2WbcdOrMMqbMJoeSBIt0kwqqjKzA/J6ce97WPsYjMsAJ1hsRkgXdVvQbU0nHEj
9fhwyqBKQO/a599BXRKVEQu0rp0QMa2M1qUTVf3q0eqEXnwULEmo4C1jelSJ1BK9mACSS3N6uzN7
8NHtifjrE5I/URwo2kgef3MDhQMh5Fsgd+9BB0pcTQeqRKOMoQEjrRW0ogWFzcL+jlgIqGuNjY3Z
dMa92ZUXE6vvVaYlT0APAeX+342DBsrt9S0LSoE5gqDsLe+pAP219D1BwRp3Mf125wTYZwvLqBd6
2Z5Cw8+4/WNIykCJ7Wk3/MiibCTnAICoRvgsKN5XOj9CtfajdMhAKI3Qo9GgHNcyJxeVZ11JOZ2b
lLdqgANO3U1uJBRkvweX7d70YLojFw7qtJZOr97QJFA3FAaXnwCaKrB3NuF7edDzUtvwdl8ZLSGj
lW9stH2Bvp3YaTL6BRVJZF6gMPyPAAAAAElFTkSuQmCC
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAAAjCAYAAADizJiTAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAWFJREFU
WEftmO0RgyAMhunKrMMmzMEULEEJIEhFk0gt2oM7r38CPnnJl305v8QTFoA+YYknQIZbPwS12kkh
nbbj3dkHNQpi1z93Bw0iGqcmKC+ckGSaivLkRLN+xihbUKij1mkJZSg+siqaY2LUqG1JzKA1oPc4
FPvigDJ8FdAduw0lird+5z4o+pZOA7Sh1Lc5DpTSUMCZJOu9QUNoKF97wlAS42ETo503S9uOJWuJ
1SboUgFavzQAqhUNFEQ8rejiBBWpbfdnoJBPpxVN31p9gqItGhTHkmld8BvVHq6+a1EaCl6evCdS
+3qwDM91l+gCJG+GjC+ttH311ibIeKpRvwY9aKHtoSRQ5u5AFqPTsCXMYaDBhuDAJRMJzxs8I1LQ
j+lcxRkcNEx80omcXDwlvmVNAh0Rp58OEkC3GfgtlTjntEHzUBuT6Qa5hPz3xHH5YlvC1V9MQDx+
ghKFIpu9AU+NUUQrllk2AAAAAElFTkSuQmCC
)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAAAjCAYAAADizJiTAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
D.
-
在椭圆
中,F1,F2分别是其左右焦点,若|PF1|=2|PF2|,则该椭圆离心率的取值范围是( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAAAjCAYAAADizJiTAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAWdJREFU
WEftllsSxBAQRc2WbcdOrMMqbMJoeSBIt0kwqqjKzA/J6ce97WPsYjMsAJ1hsRkgXdVvQbU0nHEj
9fhwyqBKQO/a599BXRKVEQu0rp0QMa2M1qUTVf3q0eqEXnwULEmo4C1jelSJ1BK9mACSS3N6uzN7
8NHtifjrE5I/URwo2kgef3MDhQMh5Fsgd+9BB0pcTQeqRKOMoQEjrRW0ogWFzcL+jlgIqGuNjY3Z
dMa92ZUXE6vvVaYlT0APAeX+342DBsrt9S0LSoE5gqDsLe+pAP219D1BwRp3Mf125wTYZwvLqBd6
2Z5Cw8+4/WNIykCJ7Wk3/MiibCTnAICoRvgsKN5XOj9CtfajdMhAKI3Qo9GgHNcyJxeVZ11JOZ2b
lLdqgANO3U1uJBRkvweX7d70YLojFw7qtJZOr97QJFA3FAaXnwCaKrB3NuF7edDzUtvwdl8ZLSGj
lW9stH2Bvp3YaTL6BRVJZF6gMPyPAAAAAElFTkSuQmCC
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAAAjCAYAAADizJiTAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAWFJREFU
WEftmO0RgyAMhunKrMMmzMEULEEJIEhFk0gt2oM7r38CPnnJl305v8QTFoA+YYknQIZbPwS12kkh
nbbj3dkHNQpi1z93Bw0iGqcmKC+ckGSaivLkRLN+xihbUKij1mkJZSg+siqaY2LUqG1JzKA1oPc4
FPvigDJ8FdAduw0lird+5z4o+pZOA7Sh1Lc5DpTSUMCZJOu9QUNoKF97wlAS42ETo503S9uOJWuJ
1SboUgFavzQAqhUNFEQ8rejiBBWpbfdnoJBPpxVN31p9gqItGhTHkmld8BvVHq6+a1EaCl6evCdS
+3qwDM91l+gCJG+GjC+ttH311ibIeKpRvwY9aKHtoSRQ5u5AFqPTsCXMYaDBhuDAJRMJzxs8I1LQ
j+lcxRkcNEx80omcXDwlvmVNAh0Rp58OEkC3GfgtlTjntEHzUBuT6Qa5hPz3xHH5YlvC1V9MQDx+
ghKFIpu9AU+NUUQrllk2AAAAAElFTkSuQmCC
)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAAAjCAYAAADizJiTAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
D.
-
在椭圆
中,F1,F2分别是其左右焦点,若|PF1|=2|PF2|,则该椭圆离心率的取值范围是( )
A.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAAAjCAYAAADizJiTAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAWdJREFU
WEftllsSxBAQRc2WbcdOrMMqbMJoeSBIt0kwqqjKzA/J6ce97WPsYjMsAJ1hsRkgXdVvQbU0nHEj
9fhwyqBKQO/a599BXRKVEQu0rp0QMa2M1qUTVf3q0eqEXnwULEmo4C1jelSJ1BK9mACSS3N6uzN7
8NHtifjrE5I/URwo2kgef3MDhQMh5Fsgd+9BB0pcTQeqRKOMoQEjrRW0ogWFzcL+jlgIqGuNjY3Z
dMa92ZUXE6vvVaYlT0APAeX+342DBsrt9S0LSoE5gqDsLe+pAP219D1BwRp3Mf125wTYZwvLqBd6
2Z5Cw8+4/WNIykCJ7Wk3/MiibCTnAICoRvgsKN5XOj9CtfajdMhAKI3Qo9GgHNcyJxeVZ11JOZ2b
lLdqgANO3U1uJBRkvweX7d70YLojFw7qtJZOr97QJFA3FAaXnwCaKrB3NuF7edDzUtvwdl8ZLSGj
lW9stH2Bvp3YaTL6BRVJZF6gMPyPAAAAAElFTkSuQmCC
)
B.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAAAjCAYAAADizJiTAAAAAXNSR0IArs4c6QAAAARnQU1BAACx
jwv8YQUAAAAgY0hSTQAAeiYAAICEAAD6AAAAgOgAAHUwAADqYAAAOpgAABdwnLpRPAAAAWFJREFU
WEftmO0RgyAMhunKrMMmzMEULEEJIEhFk0gt2oM7r38CPnnJl305v8QTFoA+YYknQIZbPwS12kkh
nbbj3dkHNQpi1z93Bw0iGqcmKC+ckGSaivLkRLN+xihbUKij1mkJZSg+siqaY2LUqG1JzKA1oPc4
FPvigDJ8FdAduw0lird+5z4o+pZOA7Sh1Lc5DpTSUMCZJOu9QUNoKF97wlAS42ETo503S9uOJWuJ
1SboUgFavzQAqhUNFEQ8rejiBBWpbfdnoJBPpxVN31p9gqItGhTHkmld8BvVHq6+a1EaCl6evCdS
+3qwDM91l+gCJG+GjC+ttH311ibIeKpRvwY9aKHtoSRQ5u5AFqPTsCXMYaDBhuDAJRMJzxs8I1LQ
j+lcxRkcNEx80omcXDwlvmVNAh0Rp58OEkC3GfgtlTjntEHzUBuT6Qa5hPz3xHH5YlvC1V9MQDx+
ghKFIpu9AU+NUUQrllk2AAAAAElFTkSuQmCC
)
C.![](data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAACoAAAAjCAYAAADizJiTAAAAAXNSR0IArs4c6QAAAARnQU1BAACx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)
D.
-
已知椭圆
左右两焦点为F1,F2,P是椭圆上一点,且在x轴上方,PF2⊥F1F2,OH⊥PF1于H,
.
(1)求椭圆的离心率e的取值范围;
(2)当e取最大值时,过F1,F2,P的圆Q的截y轴的线段长为6,求圆Q的方程;
(3)在(2)的条件下,过椭圆右准线L上任一点A引圆Q的两条切线,切点分别为M,N,试探究直线MN是否过定点?若过定点,请求出该定点;否则,请说明理由.
-
已知椭圆
左右两焦点为F1,F2,P是椭圆上一点,且在x轴上方,PF2⊥F1F2,OH⊥PF1于H,
.
(1)求椭圆的离心率e的取值范围;
(2)当e取最大值时,过F1,F2,P的圆Q的截y轴的线段长为6,求圆Q的方程;
(3)在(2)的条件下,过椭圆右准线L上任一点A引圆Q的两条切线,切点分别为M,N,试探究直线MN是否过定点?若过定点,请求出该定点;否则,请说明理由.
-
椭圆
,F1,F2分别是其左、右焦点,若椭圆上存在点P满足|PF1|=2|PF2|,则该椭圆离心率的取值范围是________.
-
椭圆
的左、右焦点分别为F1,F2,P为椭圆M上任一点,且|PF1|•|PF2|的最大值的取值范围是[2c2,3c2],其中
,则椭圆m的离心率e的取值范围是________.