Èçͼ£¬ÊÇһλÆï×ÔÐгµºÍһλÆïĦÍгµÔÚÏà¾à80kmµÄÁ½³Ç¼äÐÐÊ»µÄº¯ÊýͼÏó£»ÆäÖÐÆï×ÔÐгµÓÃÁË6Сʱ£¨º¬Í¾ÖÐÐÝÏ¢1Сʱ£©£¬ÆïĦÍгµÓÃÁË2Сʱ£®
£¨1£©ÓÐÈ˸ù¾ÝÕâ¸öͼÏó£¬Ìá³ö¹ØÓÚÁ½È˵ÄÐÅÏ¢ÈçÏ£º
¢ÙÆï×ÔÐгµ±ÈÆïĦÍгµÔç³ö·¢3Сʱ£¬Ííµ½2Сʱ£»
¢ÚÆï×ÔÐгµÊDZäËÙÔ˶¯£¬ÆïĦÍгµÊÇÔÈËÙÔ˶¯£»
¢ÛÆïĦÍгµÔÚ³ö·¢1.5Сʱºó×·ÉÏÆï×ÔÐгµµÄ£¬ÆäÖÐÕýÈ·µÄÐòºÅΪ£¿
£¨2£©ÉèÆï×ÔÐгµºÍÆïĦÍгµµÄÈËËù¶ÔÓ¦º¯Êý·Ö±ðΪf£¨x£©£¬g£¨x£©£»Çóf£¨x£©£¬g£¨x£©½âÎöʽ£¬²¢Ð´³ö¶¨ÒåÓò£»
£¨3£©¶¨Ò庯ÊýÊýѧ¹«Ê½ÔÚ[3£¬£¬5]ÓÐÁãµã£¬ÇóʵÊýaµÄ×î´óÖµ¡¢×îСֵ£®

½â£º£¨1£©ÐÅÏ¢1£ºÓÉͼÏó¿ÉÖªÆï×ÔÐгµÕßÔÚÆïĦÍгµÕß³ö·¢Èý¸öСʱºó²Å³ö·¢µÄ£¬²¢±ÈÆïĦÍгµÕßÌáÔçµ½´ïһСʱ
ÐÅÏ¢2£º¸ù¾ÝÎïÀí֪ʶ¿ÉÒÔÖªµÀͼÏó±íʾµÄÊÇËÙ¶ÈÇúÏߣ¬Æï×ÔÐгµÕßµÄͼÏóÊÇÇúÏ߹ʱíʾµÄÊDZäËÙÔ˶¯£¬ÆïĦÍгµÕßµÄͼÏóÊÇÖ±Ï߹ʱíʾµÄÊÇÔÈËÙÔ˶¯£®
ÐÅÏ¢3£ºÁ½Í¼ÏóµÄ½»µãÔÚ4.5h£¬²¢ÇÒÔÚ´óÓÚ4.5hÖ®ºóÆïĦÍгµÕßµÄͼÏóÔÚÉÏ·½¼´±íʾ׷ÉÏÁËÆï×ÔÐгµÕߣ¬¹ÊÆïĦÍгµÕßÔÚ³ö·¢ÁË1.5hºó×·ÉÏÁËÆï×ÔÐгµÕߣ®
ËùÒÔÐÅÏ¢¢Ù¡¢¢Ú¡¢¢Û¶¼ÊÇÕýÈ·µÄ£¬
£¨2£©µ±1¡Üx¡Ü3ʱ£¬Éè½âÎöʽΪy=kx£¬½«µã£¨3£¬50£©´úÈ룬¿ÉµÃ£¬
¡à£»
µ±3£¼x¡Ü4ʱ£¬y=50£»
µ±4£¼x¡Ü5ʱ£¬Éè½âÎöʽΪy=k1x+b£¬½«µã£¨4£¬50£©£¬£¨5£¬70£©´úÈ룬¿ÉµÃ£¬¡à£¬¡ày=20x-30
µ±5£¼x¡Ü6ʱ£¬Éè½âÎöʽΪy=k2x+b£¬½«µã£¨6£¬80£©£¬£¨5£¬70£©´úÈ룬¿ÉµÃ£¬¡à£¬¡ày=10x+20
¡à
º¯ÊýµÄ¶¨ÒåÓòΪ£º[0£¬6]£®
Éè½âÎöʽΪg£¨x£©=k3x+b£¬½«µã£¨3£¬0£©£¬£¨5£¬80£©´úÈ룬¿ÉµÃ£¬½âµÃ£¬
¡àg£¨x£©=40x-120
º¯ÊýµÄ¶¨ÒåÓòΪ£º[3£¬5]£®
£¨3£©º¯Êý=x2-2x+a
¡ßº¯ÊýÔÚ[3£¬5]ÓÐÁãµã
¡à
¡à-5¡Üa¡Ü-3
¡àʵÊýaµÄ×î´óֵΪ-3¡¢×îСֵΪ-5£®
·ÖÎö£º£¨1£©¸ù¾ÝͼÏó¶Ô¸÷ÐÅÏ¢½øÐзÖÎö£¬´Ó¶øµÃ³öÕýÈ·´ð°¸£®
£¨2£©º¯Êýf£¨x£©·Ö¶ÎÇó½â£¬¿ÉµÃ·Ö¶Îº¯Êý£»Éè½âÎöʽΪg£¨x£©=k3x+b£¬½«µã£¨3£¬0£©£¬£¨5£¬80£©´úÈ룬¿ÉµÃ½âÎöʽ£»
£¨3£©º¯Êý=x2-2x+a£¬¸ù¾Ýº¯ÊýÔÚ[3£¬£¬5]ÓÐÁãµã£¬¼´¿ÉÇóµÃʵÊýaµÄ×î´óÖµ¡¢×îСֵ£®
µãÆÀ£º±¾Ì⿼²éµÄÖصãÊǺ¯ÊýÄ£Ð͵Ĺ¹½¨£¬¿¼²é·ÖÀàÌÖÂÛµÄÊýѧ˼Ï룬¿¼²éº¯ÊýµÄÁãµã£¬½âÌâµÄ¹Ø¼üÊÇÕýÈ··ÖÀ࣮
Á·Ï°²áϵÁдð°¸
Ïà¹ØÏ°Ìâ

¿ÆÄ¿£º¸ßÖÐÊýѧ À´Ô´£º ÌâÐÍ£º

Èçͼ£¬ÊÇһλÆï×ÔÐгµºÍһλÆïĦÍгµÔÚÏà¾à80kmµÄÁ½³Ç¼äÐÐÊ»µÄº¯ÊýͼÏó£»ÆäÖÐÆï×ÔÐгµÓÃÁË6Сʱ£¨º¬Í¾ÖÐÐÝÏ¢1Сʱ£©£¬ÆïĦÍгµÓÃÁË2Сʱ£®
£¨1£©ÓÐÈ˸ù¾ÝÕâ¸öͼÏó£¬Ìá³ö¹ØÓÚÁ½È˵ÄÐÅÏ¢ÈçÏ£º
¢ÙÆï×ÔÐгµ±ÈÆïĦÍгµÔç³ö·¢3Сʱ£¬Ííµ½2Сʱ£»
¢ÚÆï×ÔÐгµÊDZäËÙÔ˶¯£¬ÆïĦÍгµÊÇÔÈËÙÔ˶¯£»
¢ÛÆïĦÍгµÔÚ³ö·¢1.5Сʱºó×·ÉÏÆï×ÔÐгµµÄ£¬ÆäÖÐÕýÈ·µÄÐòºÅΪ£¿
£¨2£©ÉèÆï×ÔÐгµºÍÆïĦÍгµµÄÈËËù¶ÔÓ¦º¯Êý·Ö±ðΪf£¨x£©£¬g£¨x£©£»Çóf£¨x£©£¬g£¨x£©½âÎöʽ£¬²¢Ð´³ö¶¨ÒåÓò£»
£¨3£©¶¨Ò庯Êý?(x)=g(
x2-2x+a40
+3)
ÔÚ[3£¬£¬5]ÓÐÁãµã£¬ÇóʵÊýaµÄ×î´óÖµ¡¢×îСֵ£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÊýѧ À´Ô´£º2011-2012ѧÄêÉÂÎ÷Ê¡±¦¼¦ÖÐѧ¸ßÈý£¨ÉÏ£©µÚ¶þ´ÎÔ¿¼ÊýѧÊÔ¾í£¨Àí¿Æ£©£¨½âÎö°æ£© ÌâÐÍ£º½â´ðÌâ

Èçͼ£¬ÊÇһλÆï×ÔÐгµºÍһλÆïĦÍгµÔÚÏà¾à80kmµÄÁ½³Ç¼äÐÐÊ»µÄº¯ÊýͼÏó£»ÆäÖÐÆï×ÔÐгµÓÃÁË6Сʱ£¨º¬Í¾ÖÐÐÝÏ¢1Сʱ£©£¬ÆïĦÍгµÓÃÁË2Сʱ£®
£¨1£©ÓÐÈ˸ù¾ÝÕâ¸öͼÏó£¬Ìá³ö¹ØÓÚÁ½È˵ÄÐÅÏ¢ÈçÏ£º
¢ÙÆï×ÔÐгµ±ÈÆïĦÍгµÔç³ö·¢3Сʱ£¬Ííµ½2Сʱ£»
¢ÚÆï×ÔÐгµÊDZäËÙÔ˶¯£¬ÆïĦÍгµÊÇÔÈËÙÔ˶¯£»
¢ÛÆïĦÍгµÔÚ³ö·¢1.5Сʱºó×·ÉÏÆï×ÔÐгµµÄ£¬ÆäÖÐÕýÈ·µÄÐòºÅΪ£¿
£¨2£©ÉèÆï×ÔÐгµºÍÆïĦÍгµµÄÈËËù¶ÔÓ¦º¯Êý·Ö±ðΪf£¨x£©£¬g£¨x£©£»Çóf£¨x£©£¬g£¨x£©½âÎöʽ£¬²¢Ð´³ö¶¨ÒåÓò£»
£¨3£©¶¨Ò庯ÊýÔÚ[3£¬£¬5]ÓÐÁãµã£¬ÇóʵÊýaµÄ×î´óÖµ¡¢×îСֵ£®

²é¿´´ð°¸ºÍ½âÎö>>

¿ÆÄ¿£º¸ßÖÐÊýѧ À´Ô´£º2010Äê¹ã¶«Ê¡¸ß¿¼³å´ÌÇ¿»¯ÑµÁ·ÊÔ¾í°ËÎÄ¿ÆÊýѧ ÌâÐÍ£ºÑ¡ÔñÌâ

Èçͼ±íʾһλÆï×ÔÐгµÕߺÍһλÆïĦÍгµÕßÔÚÏà¾à

80kmµÄÁ½³ÇÕò¼äÂÃÐеĺ¯ÊýͼÏó£¬ÓÉͼ¿ÉÖª£ºÆï×ÔÐгµ

ÕßÓÃÁË6Сʱ£¬ÑØ;ÐÝÏ¢ÁË1Сʱ£¬ÆïĦÍгµÕßÓÃÁË2Сʱ£®

¸ù¾ÝÕâ¸öº¯ÊýͼÏó£¬Ìá³ö¹ØÓÚÕâÁ½¸öÂÃÐÐÕßµÄÈçÏÂÐÅÏ¢£º

¢ÙÆï×ÔÐгµÕß±ÈÆïĦÍгµÕßÔç³ö·¢ÁË3Сʱ£¬Ííµ½1Сʱ£»

¢ÚÆï×ÔÐгµÕßÊDZäËÙÔ˶¯£¬ÆïĦÍгµÕßÊÇÔÈËÙÔ˶¯£»

¢ÛÆïĦÍгµÕßÔÚ³ö·¢ÁË1.5Сʱºó£¬×·ÉÏÁËÆï×ÔÐгµÕߣ®       

    ÆäÖÐÕýÈ·ÐÅÏ¢µÄÐòºÅÊÇ £¨     £©

A£®¢Ù¢Ú¢Û        B£®¢Ù¢Û           C£®¢Ú¢Û           D£®¢Ù¢Ú

 

²é¿´´ð°¸ºÍ½âÎö>>

ͬ²½Á·Ï°²á´ð°¸