Question

17£®Î人վµ½±±¾©Î÷Õ¾µÄD2032´Î¸ßËÙÁгµÔËÐÐʱ¿Ì±í£¨2015£©Èç±íËùʾ£®

Õ¾´Î	Õ¾Ãû	µ½´ïʱ¼ä	¿ª³µÊ±¼ä	Í£Áôʱ¼ä	Àï³Ì
1	Î人	ÆðµãÕ¾	07£º28	-	0
8	Ö£Öݶ«	09£º56	09£º59	3·Ö	536¹«Àï
13	ʯ¼Òׯ	12£º04	12£º07	3·Ö	948¹«Àï
18	±±¾©Î÷	14£º23	ÖÕµ½Õ¾	-	1229¹«Àï

£¨1£©ÁгµÓÉÎ人վʻÍù±±¾©Î÷վȫ³ÌµÄƽ¾ùËÙ¶ÈÊÇ178km/h£®
£¨2£©Áгµ´ÓÎ人µ½Ö£Öݶ«£¬Ö£Öݶ«µ½Ê¯¼Òׯ£¬Ê¯¼Òׯµ½±±¾©Î÷Èý¸ö·¶Î£¬ÔËÐÐ×î¿ìµÄ·¶ÎÊÇÎ人µ½Ö£Öݶ«£¬ÔËÐÐ×îÂýµÄ·¶ÎÊÇʯ¼Òׯµ½±±¾©Î÷£®
£¨3£©µ½Õ¾Ç°£¬×øÔÚÁгµÉϵÄСÃ÷·¢ÏÖÕ¾ÅԵķ¿ÎÝÏòºóÍË£¬ÕâÊÇÒÔÁгµÎª²ÎÕÕÎ

Answer 1

·ÖÎö £¨1£©¸ù¾Ý±íÖÐÊý¾ÝÇó³öÁгµÓÉÎ人վʻÍù±±¾©Î÷Õ¾µÄ·³ÌºÍʱ¼ä£¬¸ù¾Ý¹«Ê½v=$\frac{s}{t}$Çó³öƽ¾ùËٶȣ»
£¨2£©·Ö±ðÇó³öÁгµÔÚÈý¸ö·¶ÎµÄÔËÐйý³ÌÖÐƽ¾ùËٶȣ¬½øÐбȽϼ´¿É£®
£¨3£©ÔÚÑо¿»úеÔ˶¯Ê±£¬ÄǸö±»Ñ¡×÷±ê×¼µÄÎïÌå½Ð²ÎÕÕÎÁгµ×ªÍäʱ£¬ÁгµÏòÀïÇãб£¬³Ë¿Í×øÔÚÁгµÀÒÔÁгµÎª²ÎÕÕÎ´°Íâ·¿×ÓÊÇÇãбµÄ£»ÒÔÁгµÎª²ÎÕÕÎ·¿×Ó·¢ÉúÁËλÖõĸı䣬ÏòºóÍË£®

½â´ð ½â£º
£¨1£©ÁгµÓÉÎ人վʻÍù±±¾©Î÷Õ¾£¬t=14£º23-07£º28=6h55min=6$\frac{11}{12}$h£¬s=1229km£¬
È«³ÌµÄƽ¾ùËٶȣº
v=$\frac{s}{t}$=$\frac{1229km}{6\frac{11}{12}h}$¡Ö178km/h£»
£¨2£©Î人µ½Ö£Öݶ«£ºs₁=536km£¬t₁=09£º56-07£º28=2h28min=2$\frac{7}{15}$h£¬
ƽ¾ùËÙ¶Èv₁=$\frac{{s}_{1}}{{t}_{1}}$=$\frac{536km}{2\frac{7}{15}h}$¡Ö217km/h£»
Ö£Öݶ«µ½Ê¯¼Òׯ£ºs₂=948km-536km=412km£¬t₂=12£º04-9£º59=2h5min=2$\frac{1}{12}$h£¬
ƽ¾ùËÙ¶Èv₂=$\frac{{s}_{2}}{{t}_{2}}$=$\frac{412km}{2\frac{1}{12}h}$¡Ö198km/h£»
ʯ¼Òׯµ½±±¾©Î÷£ºs₃=1229km-948km=281km£¬t₃=14£º23-12£º07=2h16min=2$\frac{4}{15}$h£¬
ƽ¾ùËٶȣºv₃=$\frac{{s}_{3}}{{t}_{3}}$=$\frac{281km}{2\frac{4}{15}h}$¡Ö124km/h£»
ÓÉÒÔÉϼÆËã¿ÉÖª£ºv₁£¾v₂£¾v₃£¬¼´ÁгµÔÚÎ人µ½Ö£Öݶ«Â·¶ÎÔËÐеÿ죮ÔËÐÐ×îÂýµÄ·¶ÎÊÇʯ¼Òׯµ½±±¾©Î÷£®
£¨3£©×øÔÚÁгµÉϵÄСºìͬѧ£¬¿´µ½´°ÍâµÄ·¿×Ó·ÉËÙÏòºóÍËÈ¥£¬ÕâÊÇÑ¡ÔñÁгµ×÷Ϊ²ÎÕÕÎïÔì³ÉµÄ£®
¹Ê´ð°¸Îª£º£¨1£©178km/h£»£¨2£©Î人µ½Ö£Öݶ«£»Ê¯¼Òׯµ½±±¾©Î÷£»£¨3£©Áгµ£®

µãÆÀ ±¾Ì⿼²é²ÎÕÕÎïµÄÑ¡Ôñ£¬¶Ôͼ±íµÄ·ÖÎö´¦ÀíÄÜÁ¦ºÍ¹«Ê½µÄÔËÓüÆËãÄÜÁ¦£¬»ù´¡ÐÔÌâÄ¿£¬×¢ÒⵥλµÄ»»Ë㣮