Question

11£®¼×¡¢ÒÒÁ½¸ö¹¤³Ì¶Óͬʱ¿ªÊ¼Î¬ÐÞijһ¶Î·Ã棬һ¶Îʱ¼äºó£¬¼×¶Ó±»µ÷Íù±ð´¦£¬ÒÒ¶ÓÓÖÓÃÁË2СʱÍê³ÉÁËÊ£ÓàµÄάÐÞÈÎÎñ£®ÒÑÖªÒÒ¶ÓÿСʱάÐÞ·ÃæµÄ³¤¶È±£³Ö²»±ä£¬¼×¶ÓÿСʱάÐÞ·Ãæ30Ã×£®¼×¡¢ÒÒÁ½¶ÓÔÚ´Ë·¶ÎάÐÞ·ÃæµÄ×ܳ¤¶Èy£¨Ã×£©ÓëάÐÞʱ¼äx£¨Ê±£©Ö®¼äµÄº¯ÊýͼÏóÈçͼËùʾ£®
£¨1£©¼×¶Óµ÷Àëʱ£¬¼×¡¢ÒÒÁ½¶ÓÒÑάÐÞ·ÃæµÄ×ܳ¤¶ÈΪ150Ã×£®
£¨2£©Çó´Ë´ÎάÐÞ·ÃæµÄ×ܳ¤¶Èa£®
£¨3£©Çó¼×¶Óµ÷ÀëºóyÓëxÖ®¼äµÄº¯Êý¹Øϵʽ£®

Answer 1

·ÖÎö £¨1£©¸ù¾ÝͼÏó½â´ð¼´¿É£»
£¨2£©¸ù¾ÝÌâÒâµÃ³ö¼×¡¢ÒÒÁ½¶ÓÿСʱάÐÞ·ÃæµÄ×ܳ¤¶È½â´ð¼´¿É£»
£¨3£©ÉèËùÇóº¯Êý¹Øϵʽy=kx+b£¬ÀûÓôý¶¨ÏµÊý·¨½â´ð¼´¿É£®

½â´ð ½â£º£¨1£©¼×¶Óµ÷Àëʱ£¬¼×¡¢ÒÒÁ½¶ÓÒÑάÐÞ·ÃæµÄ×ܳ¤¶ÈΪ150Ã×£¬
¹Ê´ð°¸Îª£º150£®                       
£¨2£©¼×¶Óµ÷ÀëÇ°£¬¼×¡¢ÒÒÁ½¶ÓÿСʱάÐÞ·ÃæµÄ×ܳ¤¶ÈΪ150¡Â3=50£¨Ã×£©£®
¡àÒÒ¶ÓÿСʱάÐÞ·ÃæµÄ³¤¶ÈΪ50-30=20£¬
a=150+20¡Á2=190£¨Ã×£©£®          
£¨3£©ÉèËùÇóº¯Êý¹ØϵʽΪy=kx+b£®
½«µã£¨3£¬150£©£¬£¨5£¬190£©´úÈ룬µÃ
$\left\{\begin{array}{l}{3k+b=150}\\{5k+b=190}\end{array}\right.$£¬½âµÃ$\left\{\begin{array}{l}{k=20}\\{b=90}\end{array}\right.$£®           
¹Ê¼×¶Óµ÷ÀëºóyÓëxÖ®¼äµÄº¯Êý¹ØϵʽΪ£ºy=20x+90£¨3£¼x¡Ü5£©£®

µãÆÀ ±¾Ì⿼²éÁËÒ»´Îº¯ÊýµÄÓ¦Ó㬽â¾ö±¾ÌâµÄ¹Ø¼üÊǶÁ¶®Í¼Ï󣬻ñÈ¡Ïà¹ØÐÅÏ¢£¬Óôý¶¨ÏµÊý·¨Çóº¯Êý½âÎöʽ£®