ÒÑÖªA¡¢D·Ö±ðΪÍÖÔ²E£º
µÄ×ó¶¥µãÓëÉ϶¥µã£¬ÍÖÔ²µÄÀëÐÄÂÊ
£¬F1¡¢F2ΪÍÖÔ²µÄ×ó¡¢ÓÒ½¹µã£¬µãPÊÇÏß¶ÎADÉϵÄÈÎÒ»µã£¬ÇÒ
µÄ×î´óֵΪ1 £®
£¨1£©ÇóÍÖÔ²EµÄ·½³Ì£»
£¨2£©ÊÇ·ñ´æÔÚÔ²ÐÄÔÚÔµãµÄÔ²£¬Ê¹µÃ¸ÃÔ²µÄÈÎÒâÒ»ÌõÇÐÏßÓëÍÖÔ²EºãÓÐÁ½¸ö½»µãA£¬B£¬ÇÒOA
OB£¨OÎª×ø±êԵ㣩£¬Èô´æÔÚ£¬Çó³ö¸ÃÔ²µÄ·½³Ì£»Èô²»´æÔÚ£¬Çë˵Ã÷ÀíÓÉ£»
£¨3£©ÉèÖ±ÏßlÓëÔ²
ÏàÇÐÓÚA1£¬ÇÒlÓëÍÖÔ²EÓÐÇÒ½öÓÐÒ»¸ö¹«¹²µãB1£¬µ±RΪºÎֵʱ£¬|A1B1|È¡µÃ×î´óÖµ£¿²¢Çó×î´óÖµ£®
£¨1£©
£»£¨2£©´æÔÚÔ²ÐÄÔÚÔµãµÄÔ²
£¬Ê¹µÃ¸ÃÔ²µÄÈÎÒâÒ»ÌõÇÐÏßÓëÍÖÔ²EºãÓÐÁ½¸ö½»µãA£¬B£»£¨3£©1.
¡¾½âÎö¡¿±¾ÊÔÌâÖ÷ÒªÊÇ¿¼²éÁËÍÖÔ²µÄ ·½³ÌµÄÇó½â£¬ÒÔ¼°Ö±ÏßÓëÍÖÔ²µÄλÖùØÏµµÄÔËÓò¢½áºÏÁËÖ±ÏßÓëÔ²µÄλÖùØÏµÀ´¿¼²éÏ߶γ¤¶ÈµÄ×îÖµÎÊÌâµÄÔËÓá£
£¨1£©ÉèP (x£¬y)£¬F1 (¨Cc£¬0)£¬F2£¨c£¬0£©£¬ÆäÖÐ![]()
Ôò![]()
¿´×÷Ïß¶ÎADÉϵĵãP (x£¬y)µ½Ôµã¾àÀëµÄƽ·½£¬
¡àPÔÚAµã£¬x2 + y2×î´ó£¬¡àa2 ¨C c2 = 1£¬
ÓÖ
£®¡¡¡¡¡¡4·Ö
£¨2£©ÓÉ£¨1£©ÖªÍÖÔ²·½³ÌΪ
£¬
¢ÙÉèÔ²ÐÄÔÚÔµãµÄÔ²µÄÒ»ÌõÇÐÏßΪy = kx + t£¬
£®
½â·½³Ì×é
¡¡¡¡¡5·Ö
ҪʹÇÐÏßÓëÍÖÔ²ºãÓÐÁ½¸ö½»µãA£¬ B£¬Ôòʹ![]()
¼´
£¬¡¡¡¡¡¡¡¡¡¡¡¡6·Ö
![]()
Ҫʹ![]()
ËùÒÔ5t2 ¨C 4k2 ¨C 4 = 0£¬¼´5t2 = 4k2 + 4ÇÒt2£¼4k2 + 1£¬¼´4k2 + 4£¼20k2 + 5ºã³ÉÁ¢£®
ÓÖÒòΪֱÏßy = kx + tΪԲÐÄÔÚÔµãµÄÔ²µÄÒ»ÌõÇÐÏߣ¬
ËùÒÔÔ²µÄ°ë¾¶Îªr =
¡¡¡¡¡7·Ö
¢Úµ±ÇÐÏßµÄбÂʲ»´æÔÚʱ£¬ÇÐÏßΪ
Âú×㣮
×ÛÉÏ£¬´æÔÚÔ²ÐÄÔÚÔµãµÄÔ²
£¬Ê¹µÃ¸ÃÔ²µÄÈÎÒâÒ»ÌõÇÐÏßÓëÍÖÔ²EºãÓÐÁ½¸ö½»µãA£¬B£®
¡¡¡¡¡¡¡¡8·Ö
£¨3£©ÉèÖ±ÏßlµÄ·½³ÌΪy = mx + n£¬ÒòΪֱÏßlÓëÔ²C£ºx2 + y2 = R2 (1£¼R£¼2)ÏàÇÐÓÚA1£¬
ÓÉ£¨2£©Öª
¢Ù£¬
ÒòΪlÓëÍÖÔ²Ö»ÓÐÒ»¸ö¹«¹²µãB1£¬ÓÉ£¨2£©Öª
ÓÐΨһ½â£¬
Ôò
¼´4m2 ¨C n2
+ 1 = 0£¬ ¢Ú
ÓÉ¢Ù¢ÚµÃ
´ËʱA£¬BÖØºÏΪB1 (x1£¬y1)µã£¬ÓÉ
x1 = x2£¬ËùÒÔ
B1 (x1£¬y1)µãÔÚÍÖÔ²ÉÏ£¬ËùÒÔ![]()
£¬ÔÚÖ±½ÇÈý½ÇÐÎOA1B1ÖУ¬|A1B1|2
= |OB1|2 ¨C |OA1|2 =
5![]()
ÒòΪ
ʱȡµÈºÅ£¬ËùÒÔ![]()
¼´µ±
ʱ|A1B1|È¡µÃ×î´óÖµ£¬×î´óֵΪ1£®¡¡¡¡¡¡¡¡¡¡¡¡13·Ö
| Äê¼¶ | ¸ßÖÐ¿Î³Ì | Äê¼¶ | ³õÖÐ¿Î³Ì |
| ¸ßÒ» | ¸ßÒ»Ãâ·Ñ¿Î³ÌÍÆ¼ö£¡ | ³õÒ» | ³õÒ»Ãâ·Ñ¿Î³ÌÍÆ¼ö£¡ |
| ¸ß¶þ | ¸ß¶þÃâ·Ñ¿Î³ÌÍÆ¼ö£¡ | ³õ¶þ | ³õ¶þÃâ·Ñ¿Î³ÌÍÆ¼ö£¡ |
| ¸ßÈý | ¸ßÈýÃâ·Ñ¿Î³ÌÍÆ¼ö£¡ | ³õÈý | ³õÈýÃâ·Ñ¿Î³ÌÍÆ¼ö£¡ |
¿ÆÄ¿£º¸ßÖÐÊýѧ À´Ô´£º ÌâÐÍ£º
| x2 |
| a2 |
| y2 |
| b2 |
| ||
| 2 |
| PF1 |
| PF2 |
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º¸ßÖÐÊýѧ À´Ô´£º ÌâÐÍ£º
| x2 |
| a2 |
| y2 |
| b2 |
A¡¢¡À
| ||
B¡¢¡À
| ||
C¡¢¡À
| ||
D¡¢¡À
|
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º¸ßÖÐÊýѧ À´Ô´£º2013-2014ѧÄêÈ˽̰æ¸ß¿¼ÊýѧÎĿƶþÂÖרÌ⸴ϰÌá·ÖѵÁ·22Á·Ï°¾í£¨½âÎö°æ£© ÌâÐÍ£ºÑ¡ÔñÌâ
ÒÑÖªA¡¢B·Ö±ðΪÍÖÔ²
+
=1(a>b>0)µÄ×ó¡¢ÓÒ¶¥µã,C(0,b),Ö±Ïßl:x=2aÓëxÖá½»ÓÚµãD,ÓëÖ±ÏßAC½»ÓÚµãP,Èô¡ÏDBP=
,Ôò´ËÍÖÔ²µÄÀëÐÄÂÊΪ(¡¡¡¡)
(A)
(B)
(C)
(D)![]()
²é¿´´ð°¸ºÍ½âÎö>>
¿ÆÄ¿£º¸ßÖÐÊýѧ À´Ô´£º2009-2010ѧÄêºþÄÏÊ¡³¤É³Ò»ÖиßÈý£¨Ï£©µÚ¾Å´ÎÔ¿¼ÊýѧÊÔ¾í£¨Àí¿Æ£©£¨½âÎö°æ£© ÌâÐÍ£º½â´ðÌâ
²é¿´´ð°¸ºÍ½âÎö>>
¹ú¼ÊѧУÓÅÑ¡ - Á·Ï°²áÁбí - ÊÔÌâÁбí
ºþ±±Ê¡»¥ÁªÍøÎ¥·¨ºÍ²»Á¼ÐÅÏ¢¾Ù±¨Æ½Ì¨ | ÍøÉÏÓк¦ÐÅÏ¢¾Ù±¨×¨Çø | µçÐÅթƾٱ¨×¨Çø | ÉæÀúÊ·ÐéÎÞÖ÷ÒåÓк¦ÐÅÏ¢¾Ù±¨×¨Çø | ÉæÆóÇÖȨ¾Ù±¨×¨Çø
Î¥·¨ºÍ²»Á¼ÐÅÏ¢¾Ù±¨µç»°£º027-86699610 ¾Ù±¨ÓÊÏ䣺58377363@163.com