ʱ : 2019-2020学年宁夏六盘山高级中学高二上学期期末考试数学(?试题 - 百度文库ϿʼĶ
ֱߵķ3ӦƽķֱߴֱΪг4ռλùϵתΪϵ5ݶӦĽǺ;.
x2y212.֪F1F2ֱԲC??1㣬ԲϴĸͬP
m4ʹ?PF1F2Ϊ3ԲCeȡֵΧǣ A. ??13??2,2?? ??B. ?,?
?32??11?C. ??32?,? ?32?D. ?0,??2?? 2?𰸡A
ԲĽ࣬ԲĶ̰ij֪гʽmķΧȻʵķΧ
x2y2?1㣬ɵ2c?24?m̰⡿⣺F1F2ֱԲC:?m4ijm
ԲϴĸͬPʹáPF1F2Ϊ3ɵ?2ɵm2?4m?3?0m?(1,3) ԲCΪe?ѡA
㾦ԲļʵӦãڻ⣮
4?m?13????2,2?? 2??124?m?m?3
⣺4С⣬ÿС5֣.
13.⡰?x?0x2+1>0ķΪ______. 𰸡?x?0x2?1?0
ֱȫķسдɣ ⡿⣺Ϊȫ
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ķΪس⣬⡰?x?0x2+1>0ķΪ?x?0x2?1?0 ʴΪ?x?0x2?1?0
㾦ķسȫĹϵڻ⣮
rrrr14.֪a??1,1,2?b??1,?1,?1?cosa,b?______.
𰸡?
rrrragbrrcosa,b?rrùʽabļнǵֵ
agb2 3rr⡿⣺Ϊa??1,1,2?b??1,?1,?1?
rr22222a?1?1?2?6b?12???1????1??3
rragb?1?1???1??1???1??2??2
rrrragb?22?cosa,b?rr???
33?6agbʴΪ?2 3㾦ļнǵʱҪ⣬עĺãڻ⣮
x2y215.˫??1һPF1??5,0?ľΪ9PF2?5,0?ľ
916______.
𰸡315
ȸ˫߷꣬ٽ˫ߵĶɵõPF1?PF2?2aPF2ֵõ.
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22xy⡿Q˫??1
916?a?3b?4c?5F1??5,0?F2?5,0?Ϊ˫ߵ㣬
22xyQP˫??1ϣ 916?PF1?PF2?9?PF2?6PF2?315 QPF2?c?a?2?PF2?315
ʴΪ315.
㾦Ҫ˫ߵĶ壬ڻ.˫һ㵽ijһľʱ֪õĺᡢ꣬빫ʽ֪õ㵽һľ룬PF1?PF2?2a⣬עбҪ֤ӦȥӦòСc?a.
x2y2x2y216.֪Բ??1˫??1ͬĽ㣬ʵa________.
4a2a2𰸡1
x2y2˫??1֪a>0ҽxϣ֪4a2a2a2a20
a2a1a2(ȥ)ʵa1.
㾦֪˫ԭ㣬ȷ˽xϻyϣӦʽı̣Ȼȷabcķ飬a2b2Ӷд˫ߵı(õķ̿һҲпעȡᣬҪ©)
⣺6С⣬70֣.
17.ʵmȡʲôֵʱz?m??m?2?iǣ 1ʵ 2
3ʾzĵڸƽĵ.
𰸡1m?22m?030?m?2
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ɸĽʽɵã1鲿ʱΪʵ2鲿ʵΪʱΪ3ʵ鲿СʱڸƽڶӦĵλڵޣ
⡿⣺Qz?m??m?2?i
?1m?2?0m?2ʱΪʵ
2m?2?0m?0ʱm?0ʱΪ
3m?0m?2?0ʱ0?m?2ʱʾzĵڸƽĵޣ 㾦Ҫ鸴Ļڻ⣮
18.֪pʵx?a?x?3aa?0qʵx1?x?4 1a?1pqΪ⣬ʵxȡֵΧ 2pqıҪʵaȡֵΧ. 𰸡1?1,3?2?,???.
px?Aqx?B
1a?1ʱABpqΪ⣬xķΧ
2ABͨpqıҪóB?Aʽ飬⼴. ⡿px?Aqx?B
1a?1ʱA?x?1?x?3B?x1?x?4
?4?3??????QpqΪ⣬x?AIB
?xȡֵΧ?1,3?.
2A?x?a?x?3aB?x1?x?4
????QpqıҪ?B?A
????a?14a?
3?3a?4
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