Question

10£®Ö»ÁÐʽ£¬²»¼ÆË㣮
£¨1£©xµÄ5±¶¼ÓÉÏ24Óë6µÄ³Ë»ý£¬ºÍÊÇ209£®5x+24¡Á6=209
£¨2£©Ò»¸öÊýx¼õÈ¥$\frac{1}{3}$Óë$\frac{1}{6}$µÄºÍ£¬²îÊÇ$\frac{2}{5}$£®x-£¨$\frac{1}{3}$+$\frac{1}{6}$£©=$\frac{2}{5}$
£¨3£©Ò»Ìõ·³¤90Ã×£¬ÒѾ­ÐÞÁËxÃ×£¬»¹Ê£ÏÂ25ûÐÞ£®90-x=25
£¨4£©¼¦ÓÐ16Ö»£¬±ÈѼµÄ5±¶ÉÙ9Ö»£®5x-9=16£®

Answer 1

·ÖÎö £¨1£©´ËÌâ×îºóÒ»²½ÊÇÇóºÍ£¬Á½ÊýÖ®ºÍÊÇ209£¬Á½¸ö¼ÓÊý·Ö±ðÊÇxµÄ5±¶¡¢24Óë6µÄ³Ë»ý£¬xµÄ5±¶ÊÇ5x£¬24Óë6µÄ³Ë»ýÊÇ24¡Á6£¬¸ù¾Ý¼Ó·¨µÄÒâÒå¼´¿ÉÁгö·½³Ì£®
£¨2£©×îºóÒ»²½ÊÇÇó²î£¬Á½ÊýÖ®²îÊÇ$\frac{2}{5}$£¬±»ÊýÊÇx£¬¼õÊýÊÇ£¨$\frac{1}{3}$+$\frac{1}{6}$£©£¬¸ù¾Ý¼õ·¨µÄÒâÒå¼´¿ÉÁгö·½³Ì£®
£¨3£©ÕâÌõ·³¤ºÍʣϵÄÃ×ÊýÒÑÖª£¬ÒѾ­ÐÞµÄÃ×ÊýÉèΪx£¬¸ù¾Ý¡°ÕâÌõ·µÄ³¤¶È-ÒѾ­ÐÞµÄÃ×Êý=»¹Ê£ÏµÄÃ×Êý¡±¼´¿ÉÁгö·½³Ì£®
£¨4£©ÉèѼΪxÖ»£¬ÓÉÌâÒâ¿ÉÖª£º¡°Ñ¼Ö»ÊýµÄ5±¶-9Ö»=¼¦µÄÖ»Êý¡±£¬¼¦µÄÖ»Êý¡¢±ÈѼµÄÖ»ÊýÉÙµÄÖ»ÊýÒÑÖª£¬Óɴ˼´¿ÉÁгö·½³Ì£®

½â´ð ½â£º£¨1£©5x+24¡Á6=209
          5x+144=209
      5x+144-144=209-144
              5x=65
           5x¡Â5=65¡Â5
               x=13£»

£¨2£©x-£¨$\frac{1}{3}$+$\frac{1}{6}$£©=$\frac{2}{5}$
          x-$\frac{1}{2}$=$\frac{2}{5}$
       x-$\frac{1}{2}$+$\frac{1}{2}$=$\frac{2}{5}$+$\frac{1}{2}$
            x=$\frac{9}{10}$£»

£¨3£©ÉèÒѾ­ÐÞÁËxÃ×£¬
   90-x=25
 90-x+x=25+x
     90=25+x
   25+x=90
25+x-25=90-25
      x=65£»

£¨4£©ÉèѼΪxÖ»£®
   5x-9=16
5x-6++6=16+9
     5x=25
  5x¡Â5=25¡Â5
      x=5£®
¹Ê´ð°¸Îª£º5x+24¡Á6=209£¬x-£¨$\frac{1}{3}$+$\frac{1}{6}$£©=$\frac{2}{5}$£¬90-x=25£¬5x-9=16£®

µãÆÀ ´ËÌâÊÇѧÉúÔÚÏÖʵÇé¾°ÖÐÀí½âÓÃ×Öĸ±íʾÊýµÄÒâÒ壬³õ²½ÕÆÎÕÓÃ×Öĸ±íʾÊýµÄ·½·¨£»»áÓú¬ÓÐ×ÖĸµÄʽ×Ó±íʾÊýÁ¿¹Øϵ£®