ÌâÄ¿ÄÚÈÝ
ÒÑÖªÅ×ÎïÏßy£½ax 2£«bx£«c£¨a£¼0£©ÓëxÖá½»ÓÚµãA£¨8£¬0£©ºÍB£¨£12£¬0£©£¬ÓëyÖá½»ÓÚµãC£¨0£¬6£©£®
£¨1£©Çó¸ÃÅ×ÎïÏߵĽâÎöʽ£º
£¨2£©µãDÔÚÏß¶ÎABÉÏÇÒAD£½AC£¬Èô¶¯µãM´ÓA³ö·¢ÑØÏß¶ÎABÒÔÿÃë1¸öµ¥Î»³¤¶ÈµÄËÙ¶ÈÔÈËÙÔ˶¯£¬Í¬Ê±ÁíÒ»¶¯µãNÒÔijһËÙ¶È´ÓB³ö·¢ÑØÏß¶ÎBCÔÈËÙÔ˶¯£¬ÎÊÊÇ·ñ´æÔÚijһʱ¿Ìt£¨Ã룩£¬Ê¹Ïß¶ÎMN±»Ö±ÏßCD´¹Ö±Æ½·Ö£¿Èô´æÔÚ£¬ÇëÇó³ö´ËʱµÄʱ¼ätºÍµãNµÄÔ˶¯ËÙ¶È£»Èô²»´æÔÚ£¬Çë˵Ã÷ÀíÓÉ£»21·ÊÀ¼Í*½ÌÓýÍø
£¨3£©ÔÚµÚ¶þÏóÏÞµÄÅ×ÎïÏßÉÏȡһµãP£¬Ê¹µÃS¡÷PCA£½S¡÷PCB£¬ÔÙÔÚÅ×ÎïÏßÉÏÕÒÒ»µãQ£¨²»Óë
µãA¡¢B¡¢CÖØºÏ£©£¬Ê¹µÃtan¡ÏPBQ£½
£¬ÇóµãQµÄ×ø±ê£®
£¨1£©y£½£
(x£8)(x£«12) £½£
x2£
x£«6¡¡¡¡¡¡¡¡¡¡(2·Ö)
£¨2£©ÓÉÌâÒ⣬AD£½AC£½10£¬µãDµÄ×ø±êÊÇ£¨£2£¬0£©£¬ÓÐBD£½AD¡¡¡¡¡¡(3·Ö)
ÈôCD´¹Ö±Æ½·ÖMN£¬DN£½DM£¬¡ÏNDC£½¡ÏMDC£½¡ÏACD£¬¡àDN¡ÎAC¡¡¡(4·Ö)
ÓÚÊÇBN£½CN£¬DNÊÇÖÐλÏߣ¬DN£½
£½5£¬¡àAM£½t£½5¡¡¡¡¡¡¡¡¡(5·Ö)
¶øBN£½5VN£½6
£¬µãNµÄÔ˶¯ËÙ¶ÈÊÇ
¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡(6·Ö)
£¨3£©ÓÉS¡÷PCA£½S¡÷PCB£¬µÃPC¡ÎAB£¬ÔòP£¨£4£¬6£©¡¡¡¡¡¡¡¡¡¡¡¡¡¡(7·Ö)
Èôtan¡ÏPBQ£½
£¬Ôò¡ÏPBQ£½¡ÏCBA£¬ÓÚÊÇ¡ÏPBC£½¡ÏQBA£¬×÷PG¡ÍBC£¬QH¡ÍAB£¬
×¢Òâµ½PG£½
£¬CG£½
£¬BG£½
£¬Ôò
£½
¡¡¡¡¡¡¡¡¡¡(8·Ö)
Q£¨x£¬£
x2£
x£«6£©£¬ÓÉ
£½
£¬½âµÃx£½»ò£12£¨ÉáÈ¥£©¡¡(9·Ö)
¹ÊµãQµÄ×ø±êÊÇ£¨
£¬
£©¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡¡(10·Ö)
ÈçͼÊÇÒ»¸öÈýÀâÖùµÄͼÐΣ¬Ëü¹²ÓÐÎå¸öÃæ£¬ÆäÖÐÈý¸öÃæÊdz¤·½ÐΣ¬Á½¸öÃæÊÇÈý½ÇÐΣ¬Çëд³ö·ûºÏÏÂÁÐÌõ¼þµÄÀ⣨˵Ã÷£ºÃ¿¸ö¿ÕÖ»Ðèд³öÒ»Ìõ¼´¿É£©£®
£¨1£©ÓëÀâBB1ƽÐеÄÀ⣺ £»
|
£¨3£©ÓëÀâBB1²»ÔÚÍ¬Ò»Æ½ÃæÄÚµÄÀ⣺ £®
ΪӽÓÖйú¹²²úµ³½¨µ³90ÖÜÄ꣬ijУ¾Ù°ì¡°ºì¸è°éÎҳɳ¤¡±¸èÓ½±ÈÈü»î¶¯£¬²ÎÈüͬѧµÄ³É¼¨·Ö±ð»æÖÆ³ÉÆµÊý·Ö²¼±íºÍƵÊý·Ö²¼Ö±·½Í¼£¨¾ù²»ÍêÕû£©ÈçÏ£º
| ·ÖÊý¶Î | ƵÊý | ƵÂÊ |
| 80¡Üx£¼85 | 9 | 0.15 |
| 85¡Üx£¼90 | m | 0.45 |
| 90¡Üx£¼95 | ¡ö | ¡ö |
| 95¡Üx£¼100 | 6 | n |
£¨1£©Çóm£¬nµÄÖµ·Ö±ðÊǶàÉÙ£»
£¨2£©ÇëÔÚͼÖв¹È«ÆµÊý·Ö²¼Ö±·½Í¼£»
£¨3£©±ÈÈü³É¼¨µÄÖÐλÊýÂäÔÚÄĸö·ÖÊý¶Î£¿