×Ô¿¼±Ê¼ÇС³­0020¸ßµÈÊýѧһ֪ʶµã×ܽá¹éÄÉСÌõ

Ç° ÑÔ ¡¶¸ßµÈÊýѧһ¡·¹²6Õ µÚÒ»Õ º¯Êý

1.Ö÷ÒªÊǶԸßÖÐ֪ʶµÄ¸´Ï°£» 2.Ϊ½ñºó֪ʶ´òÏÂÁ¼ºÃµÄ»ù´¡£»

3.±¾ÕÂ֪ʶÔÚÀúÄ꿼ÌâÖÐËùÕ¼µÄ·ÖÖµ²¢²»¶à£¬Ò»°ãÊÇ5·Ö×óÓÒ. µÚ¶þÕ ¼«ÏÞºÍÁ¬Ðø

Ö÷ÒªÊÇѧϰ¼«ÏÞÓëÁ¬ÐøµÄ¸ÅÄÊǺóÃæÕ½ڵĻù´¡£» ±¾ÕÂÄÚÈÝÔÚÀúÄ꿼ÌâÖÐËùÕ¼·ÖֵΪ20×óÓÒ. µÚÈýÕ µ¼ÊýÓë΢·Ö

Ö÷ÒªÊÇѧϰº¯ÊýµÄµ¼ÊýºÍ΢·Ö£¬ÕâÊǸßÊýµÄºËÐĸÅÄî. ±¾ÕÂÄÚÈÝÔÚÀúÄ꿼ÌâÖÐËùÕ¼·ÖֵΪ15·Ö×óÓÒ. µÚËÄÕ ΢·ÖÖÐÖµ¶¨ÀíºÍµ¼ÊýµÄÓ¦ÓÃ

Ö÷ÒªÊÇÕÆÎÕ΢·ÖÖÐÖµ¶¨ÀíµÄÓ¦Óã¬ÕâÒ»ÕÂÈÝÒ׳ö´óÌâ¡¢ÄÑÌ⣻ ±¾ÕÂÔÚÀúÄ꿼ÌâÖÐËùÕ¼·ÖֵΪ20·Ö×óÓÒ. µÚÎåÕ һԪº¯Êý»ý·Öѧ

Ö÷Ҫѧϰ²»¶¨»ý·ÖºÍ¶¨»ý·Ö£¬ÕâÓÖÊǸßÊýµÄºËÐĸÅÄ ±¾ÕÂÄÚÈÝÔÚÀúÄ꿼ÌâÖÐËùÕ¼·ÖֵΪ25·Ö×óÓÒ. µÚÁùÕ ¶àÔªº¯Êý΢»ý·Ö

Ö÷ÒªÊÇѧϰ¶àÔªº¯ÊýµÄ΢»ý·ÖµÄ¼ÆË㣻 ±¾ÕÂÄÚÈÝÔÚÀúÄ꿼ÊÔÌâÖÐËùÕ¼·ÖֵΪ15·Ö×óÓÒ.

µÚÒ»Õ º¯Êý 1.1 Ô¤±¸ÖªÊ¶

1.1.1 ³õµÈ´úÊýµÄ¼¸¸öÎÊÌâ 1.Ò»Ôª¶þ´Î·½³Ì

¹ØÓÚxµÄ·½³Ìax2£«bx£«c£½0£¨a¡Ù0£©£¬³ÆΪһԪ¶þ´Î·½³Ì£¬£¨1£©Çó¸ù¹«Ê½£º

µ±¡÷£¾0ʱ£¬·½³ÌÓÐÁ½¸ö²»Í¬µÄʵ¸ù£ºµ±¡÷£½0ʱ£¬·½³ÌÓÐÒ»¸ö¶þÖØʵ¸ù£ºµ±¡÷£¼0ʱ£¬·½³ÌÓÐÒ»¶Ô¹²é¸ù£º£¨2£©¸ùÓëϵÊýµÄ¹Øϵ£¨Î¤´ï¶¨Àí£©£º

³ÆΪ´Ë·½³ÌµÄÅбðʽ.

1

£¨3£©Ò»Ôª¶þ´Îº¯Êý£¨Å×ÎïÏߣ©£ºy£½ax2£«bx£«c£¨a¡Ù0£©£¬ µ±a£¾0ʱ£¬¿ª¿ÚÏòÉÏ£¬µ±a£¼0ʱ£¬¿ª¿ÚÏòÏÂ. ¶Ô³ÆÖá

¶¥µã×ø±ê

3

2

2

Àý1.Èôx£«x£«ax£«bÄܱ»x£­3x£«2Õû³ý£¬Ôòa¡¢bÊǶàÉÙ£¿

½áÂÛ£º¶àÏîʽf£¨x£©£¬g£¨x£©.Èôf£¨x£©Äܱ»g£¨x£©Õû³ý£¬Ôòg£¨x£©£½0µÄ¸ù¾ùΪf£¨x£©£½0µÄ¸ù.

½â£ºÁîx2£­3x£«2£½0£¬½âµÃx£½1»ò2£¬´úÈë±»³ýʽµÃ

½âµÃ

2.¶þÔªÒ»´Î·½³Ì×é Á½¸öδ֪Á¿x£¬yÂú×ãµÄÐÎÈ統ʱµ±Ê±µ±Ê±

£¬·½³Ì×éÓÐΨһ½â£»

£¬·½³Ì×éÎ޽⣻ £¬·½³Ì×éÓÐÎÞÇî¶à½â.

µÄ·½³Ì×é³ÆΪ¶þÔªÒ»´Î·½³Ì×é.

Àý2.ÒÑÖª·½³Ì×é

£¨1£©Èô·½³Ì×éÓÐÎÞÇî¶à½â£¬ÇóaµÄÖµ£» £¨2£©µ±a£½6ʱ£¬Çó·½³Ì×éµÄ½â. ½â£º£¨1£©ÒòΪ·½³Ì×éÓÐÎÞÇî¶à×é½â£¬ËùÒÔ½âµÃa£½4.

,

2

£¨2£©µ±a£½6ÊÇ£¬Ô­·½³Ì×é±äΪ½âµÃ

,

3.²»µÈʽ

£¨1£©Ò»Ôª¶þ´Î²»µÈʽ

¿¼ÂDz»µÈʽax2£«bx£«c£¾0£¬Èç¹û¼ÇÒ»Ôª¶þ´Î·½³Ìax2£«bx£«c=0µÄÁ½¸ö²»Í¬Êµ¸ù·Ö±ðΪx1£¬

x2£¬ÇÒx1£¼x2£¬¸ù¾ÝÒ»Ôª¶þ´Îº¯ÊýµÄͼÐοÉÖª£º µ±a£¾0ʱ£¬Õâ¸ö²»µÈʽµÄ½â¼¯ÊÇ{x©¦x£¼x1»òx£¾x2}£» µ±a£¼0ʱ£¬ËüµÄ½â¼¯ÊÇ{x©¦x1£¼x£¼x2}.

ÓÃÀàËƵķ½·¨¿ÉÒÔÇó½â²»µÈʽax2£«bx£«c¡Ý0£¬ax2£«bx£«c£¼0ºÍax2£«bx£«c¡Ü0. Àý3.½â²»µÈʽx2£­5x£«6¡Ý0. ½â£ºÁîx2£­5x£«6£½0, £¨x£­2£©£¨x£­3£©£½0, µÃx£½2»òx=3,

¡à ½â¼¯Îª£¨£­¡Þ£¬2]¡È[3£¬£«¡Þ£©. Àý4.½â²»µÈʽx2£«£¨1£­a£©x£­a£¼0. ½â£ºÁîx2£«£¨1£­a£©x£­a£½0, £¨x£­a£©£¨x£«1£©£½0, µÃx£½a»òx£½£­1,

¢ÙÈôa£¼£­1£¬½â¼¯Îª£¨a£¬£­1£©, ¢ÚÈça£½£­1£¬½â¼¯Îª¦µ, ¢ÛÈôa£¾£­1£¬½â¼¯Îª£¨£­1£¬a£©. £¨2£©¾ø¶ÔÖµ²»µÈʽ

²»µÈʽ©¦f£¨x£©©¦£¾a£¾0µÈ¼ÛÓÚf£¨x£©£¾a»òf£¨x£©£¼£­a£» ²»µÈʽ©¦f£¨x£©©¦£¼aµÈ¼ÛÓÚ£­a£¼f£¨x£©£¼a. Àý5.½âÏÂÁк¬Óоø¶ÔÖµ·ûºÅµÄ²»µÈʽ£º £¨1£©©¦2x£­3©¦¡Ü5 £¨2£©©¦3x£­1©¦¡Ý7 ½â£º£¨1£©Ô­²»µÈʽµÈ¼ÛÓÚ£­5¡Ü2x£­3¡Ü5 ½âµÃ£º£­1¡Üx¡Ü4. ËùÒԽ⼯Ϊ[£­1£¬4].

£¨2£©Ô­²»µÈʽµÈ¼ÛÓÚ3x£­1¡Ü£­7»ò3x£­1¡Ý7£¬ 3x£­1¡Ü£­7µÄ½â¼¯Îªx¡Ü£­2£¬ 3x£­1¡Ý7µÄ½â¼¯Îªx¡Ý,

3

ÁªÏµ¿Í·þ£º779662525#qq.com(#Ì滻Ϊ@) ËÕICP±¸20003344ºÅ-4