Question

(±¾Ð¡ÌâÂú·Ö10·Ö)
¼×ÒÒÁ½³µÍ¬Ê±´ÓAµØ³ö·¢,ÒÔ¸÷×ÔµÄËÙ¶ÈÔÈËÙÏòBµØÐÐÊ».¼×³µÏȵ½´ïBµØ,Í£ÁôһСʱºó°´Ô­Â·ÒÔÁíÒ»ËÙ¶ÈÔÈËÙ·µ»Ø,Ö±µ½Á½³µÏàÓö.ÒÒ³µµÄËÙ¶ÈΪ60km/h£¬Á½³µ¼ä¾àÀëy(km)ÓëÒÒ³µÐÐʻʱ¼äx(h)Ö®¼äµÄº¯ÊýͼÏóÈçÏÂ.
(1)½«Í¼ÖУ¨    £©ÌîÉÏÊʵ±µÄÖµ£¬²¢Çó¼×³µ´ÓAµ½BµÄËÙ¶È.
(2)Çó´Ó¼×³µ·µ»Øµ½ÓëÒÒ³µÏàÓö¹ý³ÌÖÐyÓëxµÄº¯Êý¹Øϵʽ£¬×Ô±äÁ¿È¡Öµ·¶Î§¡£
(3) Çó³ö¼×³µ·µ»ØʱÐÐÊ»Ëٶȼ°ABÁ½µØµÄ¾àÀë.

Answer 1

£¨1£©60£¬                ¡­¡­¡­¡­¡­¡­¡­¡­¡­2·Ö
¼×³µ´ÓAµ½BµÄÐÐÊ»ËÙ¶ÈΪ100km/h.                   ¡­¡­¡­¡­¡­¡­¡­¡­¡­2·Ö£¨2£©Éèy=kx+b°Ñ£¨4,60£©£¬£¨4.4,0£©´úÈëÉÏʽµÃ
¡ày=-150x+660£»                                  ¡­¡­¡­¡­¡­¡­¡­¡­¡­2·Ö
×Ô±äÁ¿xµÄÈ¡Öµ·¶Î§Îª4¡Üx¡Ü4.4;                  ¡­¡­¡­¡­¡­¡­¡­¡­¡­1·Ö
£¨3£©Éè¼×³µ·µ»ØÐÐÊ»ËÙ¶ÈΪv km/h,ÓР 0.4¡Á£¨60+v£©=60£¬µÃ   v="90" km/h.¡­¡­¡­1·ÖA,BÁ½µØµÄ¾àÀëÊÇ3¡Á100=300£¨km£©,                ¡­¡­¡­¡­¡­¡­¡­¡­¡­1·Ö
¼´¼×³µ´ÓAµØµ½BµØʱ£¬ËÙ¶ÈΪ100km/h,ʱ¼äΪ3Сʱ¡£ ¡­¡­¡­¡­¡­¡­¡­¡­¡­1·Ö

½âÎö