ÌâÄ¿ÄÚÈÝ

Óйز¿ÃÅÒªÁ˽â½ÚÄܼõÅÅÏà¹Ø֪ʶµÄÆÕ¼°Çé¿ö£¬ÃüÖÆÁËÒ»·ÝÓÐ10µÀÌâµÄÎÊ¾í£¨Ã¿Ìâ1·Ö£©£¬¶Ô¼×¡¢ÒÒÁ½¸öÉçÇø½øÐÐÎʾíµ÷²é£®ÆäÖÐÔڼס¢ÒÒÁ½¸öÉçÇøÖи÷Ëæ»ú³éÈ¡5»§¼ÒÍ¥½ÓÊܵ÷²é£®¼×ÉçÇø5»§¼ÒÍ¥µÃ·ÖΪ£º5¡¢8¡¢9¡¢9¡¢9£»ÒÒÉçÇø5»§¼ÒÍ¥µÃ·ÖΪ£º6¡¢7¡¢8¡¢9¡¢10£®
£¨I£©ÇëÎʼס¢ÒÒÁ½¸öÉçÇøÖÐÄĸöÉçÇøµÄÎʾíµÃ·Ö¸üÎȶ¨£¿²¢ËµÃ÷ÀíÓÉ£®
£¨II£©Èç¹û°ÑÒÒÉçÇø5»§¼ÒÍ¥µÄµÃ·Ö¿´³ÉÒ»¸ö×ÜÌ壬²¢Óüòµ¥Ëæ»ú³éÑùµÄ·½·¨´ÓÖгéÈ¡Ñù±¾ÈÝÁ¿Îª2µÄÑù±¾£¬ÇóÑù±¾Æ½¾ùÊýÓë×ÜÌåƽ¾ùÊýÇ¡ºÃÏàͬµÄ¸ÅÂÊ£®
·ÖÎö£º£¨¢ñ£©¸ù¾ÝÌâÒ⣬·Ö±ð¼ÆËã¼×¡¢ÒÒÁ½¸öÉçÇøµÄ5»§¼ÒÍ¥µÄƽ¾ùµÃ·Ö£¬ÔÙ¼ÆËãÁ½¸öÉçÇøµÄ5»§¼ÒÍ¥µÄ·½²î£¬±È½Ï´óС¿ÉµÃ´ð°¸£¬
£¨¢ò£©ÁоٴÓÒÒÉçÇø5»§¼ÒÍ¥µÄµÃ·ÖÖÐÈÎÑ¡2ÃûͬѧµÄµÃ·ÖµÄÇé¿ö£¬¿ÉµÃÆäÇé¿öÊýÄ¿£®´ÓÖвéÕҿɵÃÆäÖÐƽ¾ùÊýΪ8µÄÇé¿ö£¬¿ÉµÃÆäÇé¿öÊýÄ¿£¬ÓɵȿÉÄÜʼþµÄ¸ÅÂʼÆËã¿ÉµÃ´ð°¸£®
½â´ð£º½â£º£¨¢ñ£©¼×ÉçÇøµÄ5»§¼ÒÍ¥µÄƽ¾ùµÃ·ÖΪ£º
5+8+9+9+9
5
=8£¬
·½²îS12=
1
5
[£¨5-8£©2+£¨8-8£©2+£¨9-8£©2+£¨9-8£©2+£¨9-8£©2]=2.4£»
ÒÒÉçÇøµÄ5»§¼ÒÍ¥µÄƽ¾ùµÃ·ÖΪ£º
6+7+8+9+10
5
=8£¬
Æä·½²îS22=
1
5
[£¨6-8£©2+£¨7-8£©2+£¨8-8£©2+£¨9-8£©2+£¨10-8£©2]=2£»
±È½Ï¿ÉµÃS12£¾S22£¬
¹ÊÒÒÉçÇøµÄ³É¼¨Îȶ¨Ò»Ð©£»
£¨¢ò£©´ÓÒÒÉçÇø5»§¼ÒÍ¥µÄµÃ·ÖÖÐÈÎÑ¡2ÃûͬѧµÄµÃ·ÖµÄÇé¿öÓУ¨6£¬7£©£¬£¨6£¬8£©£¬£¨6£¬9£©£¬£¨6£¬10£©£¬£¨7£¬8£©£¬£¨7£¬9£©£¬£¨7£¬10£©£¬£¨8£¬9£©£¬£¨8£¬10£©£¬£¨9£¬10£©£¬¹²10ÖÖÇé¿ö£»
ÆäÖÐƽ¾ùÊýΪ8µÄÓУ¨6£¬10£©£¬£¨7£¬9£©£¬¹²2ÖÖÇé¿ö£»
¹ÊËùÇóµÄ¸ÅÂÊΪP=
2
10
=
1
5
£®
µãÆÀ£º±¾Ì⿼²éÊý¾ÝµÄƽ¾ùÊý¡¢·½²îµÄ¼ÆËã¼°ÒâÒ壬µÈ¿ÉÄÜʼþµÄ¸ÅÂʵļÆË㣻עÒâƽ¾ùÊý¡¢·½²î¼ÆËãÁ¿½Ï´ó£¬ÒªÁ¦Çó׼ȷ£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿

Î¥·¨ºÍ²»Á¼ÐÅÏ¢¾Ù±¨µç»°£º027-86699610 ¾Ù±¨ÓÊÏ䣺58377363@163.com

¾«Ó¢¼Ò½ÌÍø