????F1?F2????????(??|F1F2 |)??????????? - PowerPoint PPT Presentation

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????F1?F2????????(??|F1F2 |)???????????

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Title: 1 Author: JSDTZXH Last modified by: ACER Created Date: 6/8/2005 2:14:23 AM Document presentation format: Company – PowerPoint PPT presentation

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Title: ????F1?F2????????(??|F1F2 |)???????????


1
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2
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1.?????
????F1?F2????????(??F1F2 )???????????
2.????????
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a2b2c2
3.???a,b,c????
3
y
?.?????
(0,b)
B2
a
b
A2
A1
o
c
F1
F2
B1
(0,-b)
? y0,? x ? , ????? x????? ? x0,? y ?,
????? y?????
???? ( -a , 0 ) ( a , 0 ) ( -b , 0 ) ( b , 0
) ???????A1A2?B1B2????????????????????2a?2b ?
a?b?????????????????
4
??? ??????????????
????
  • x24y216

5
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?????????A1A2???B1B2 ,????????????
B2
A2
A1
o
F1
F2
B1
6
?.?????
???? xa, y b??????
1??? -axa, -byb
-axa, -byb
7
?.??????
????? ????x??y???????
O
????? (1)?x??-x????,????y??? (2)?y??-y????,????
x??? (3)?x??-x,???y??-y????,????????????
8
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  • ????????????,??x??y???????????( )
  • A?x2y
  • B?x22xyy20
  • C?(x-1)2(y-1)2 1
  • D?9x2y24

D
9
?.??????
e
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??agtcgt0 ??0ltelt1
1????????
2???????????
1)e ??? 1,c ???? a,?? b???, ????? 2)e ??? 0,c
???? 0,?? b???,?????
3e?a,b???
10
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  • 1???????,?????????
  • ?9x2y236?
  • ?x29y236?

??e??????? e??????? ???
11
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12
???????16x225y2400,
? 2
8
10
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6
80
2??????????????
13
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1???????,???????
(1)?????,???x??,??????????8?6
(2)?????????,?????10,????0.6
14
(3)?????,???x??,????????????2,???????1.
(4)??????????F(6,0)?B, C???????,?FBC??????, ?????
??????
15
????
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????
????
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???
a?b?c???
? ? ? ? ? ? ? ?
x a,y b
??x??y??????????????
(a,0)?(-a,0)?(0,b)?(0,-b)
(c,0)?(-c,0)
?????a,?????b. agtb
a2b2c2
16
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????
????
???
???
a?b?c???
x a,y b
x b,y a
??x??y??????????????
??x??y??????????????
(a,0)?(-a,0)?(0,b)?(0,-b)
(b,0)?(-b,0)?(0,a)?(0,-a)
(c,0)?(-c,0)
(0 , c)?(0, -c)
?????a,?????b. agtb
?????a,?????b. agtb
a2b2c2
a2b2c2
17
? ?
1.????????????????????????????????????
2.?????????????a,b,c, e????????????????? ???
18
??P32 ?? 1,2,3 ?????p25
19
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