ÌâÄ¿ÄÚÈÝ

Ò»´ÎÆÚÖп¼ÊÔÖУ¬A¡¢B¡¢C¡¢D¡¢EÒ»¹²ÎåλͬѧµÄÊýѧ¡¢Ó¢ÓïµÈÓйØÇé¿öÈçϱíËùʾ£º
A B C D E ƽ¾ù·Ö ±ê×¼²î
Êýѧ 71 72 69 68 70
2
Ó¢Óï 88 82 94 85 76 85
£¨1£©Íê³ÉÉÏ±í£»
£¨2£©±È½Ï²»Í¬Ñ§¿Æ¿¼ÊԳɼ¨µÄºÃÓë²î£¬²ÉÓñê×¼·ÖÊÇÒ»¸öºÏÀíµÄÑ¡Ôñ£¬±ê×¼·ÖµÄ¼ÆË㹫ʽÊÇ£º±ê×¼·Ö=£¨¸öÈ˳ɼ¨-ƽ¾ù³É¼¨£©¡Â³É¼¨±ê×¼²î£¬´Ó±ê×¼·Ö¿´£¬±ê×¼·Ö´óµÄ¿¼ÊԳɼ¨¸üºÃ£®ÇëÄãÅжÏAͬѧÔÚ±¾´Î¿¼ÊÔÖУ¬ÊýѧÓëÓ¢ÓïÄĸöѧ¿Æ¿¼µÃ¸üºÃ£®
·ÖÎö£º£¨1£©¸ù¾ÝËãÊõƽ¾ùÊýµÄ¼ÆËã·½·¨ÁÐʽ½øÐмÆËã¼´¿ÉÇó³öÊýѧµÄƽ¾ù·Ö£»ÏÈÇó³öÓ¢ÓïµÄ·½²î£¬ÔÙ¸ù¾Ý±ê×¼²îΪ·½²îµÄËãÊõƽ·½¸ù½â´ð£»
£¨2£©¸ù¾Ý±ê×¼·Ö¹«Ê½Çó³öAͬѧÁ½¿ÆµÄ±ê×¼·Ö£¬¼´¿É½â´ð£®
½â´ð£º½â£º£¨1£©Êýѧƽ¾ù·Ö=
1
5
£¨71+72+69+68+70£©=
1
5
¡Á350=70£»
Ó¢ÓïµÄ·½²îS2=
1
5
[£¨88-85£©2+£¨82-85£©2+£¨94-85£©2+£¨85-85£©2+£¨76-85£©2]£¬
=
1
5
£¨9+9+81+0+81£©£¬
=
1
5
¡Á180£¬
=36£¬
ËùÒÔ£¬±ê×¼²îΪS=
36
=6£»
ËùÒÔ£¬±íÖÐÒÀ´ÎÌîÈë70£¬6£»

£¨2£©AͬѧÊýѧ±ê×¼·ÖΪ£º£¨71-70£©¡Â
2
=
2
2
£»
AͬѧӢÓï±ê×¼·ÖΪ£º£¨88-85£©¡Â6=
1
2
£¬
¡ß
2
2
£¾
1
2
£¬
¡àӢӵøüºÃһЩ£®
µãÆÀ£º±¾Ì⿼²éÁ˱ê×¼²î£¬ËãÊõƽ¾ùÊýµÄÎÊÌ⣬Êì¼ÇËãÊõƽ¾ùÊýµÄ¼ÆË㹫ʽ£¬·½²îµÄ¼ÆË㣬±ê×¼²îµÈÓÚ·½²îµÄËãÊõƽ·½¸ù£¬Êì¼Ç¸÷¹«Ê½Ó붨ÒåÊǽâÌâµÄ¹Ø¼ü£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿

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

¾«Ó¢¼Ò½ÌÍø