Question

(13·Ö) ij¸ß¼¶ÖÐѧ¹²ÓÐѧÉú3 000Ãû£¬¸÷Ä꼶ÄС¢Å®ÉúÈËÊýÈçÏÂ±í£º

	¸ßÒ»Ä꼶	¸ß¶þÄ꼶	¸ßÈýÄ꼶
ÄÐÉú	595	560	y
Å®Éú	605	x	z

ÒÑÖªÔÚȫУѧÉúÖÐËæ»ú³éÈ¡1Ãû£¬³éµ½¸ß¶þÄ꼶ŮÉúµÄ¸ÅÂÊÊÇ0.18.

(1)ÇóxµÄÖµ£»

(2)ÏÖÓ÷ֲã³éÑùµÄ·½·¨ÔÚȫУ³éÈ¡120ÃûѧÉú£¬ÎÊÓ¦ÔÚ¸ßÈýÄ꼶³éȡѧÉú¶àÉÙÃû£¿

(3)ÔÚ(2)µÄÇ°ÌáÏ£¬ÒÑÖªy¡Ý345£¬z¡Ý345£¬Çó¸ßÈýÄ꼶ÖÐÄÐÉú±ÈÅ®Éú¶àµÄ¸ÅÂÊ£®

Answer 1

½â£º(1)¡ß£½0.18£¬¡àx£½540.¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­3·Ö

(2)¸ßÈýÄ꼶ÈËÊýΪy£«z£½3000£­(595£«605£«560£«540)£½700£¬

ÏÖÓ÷ֲã³éÑùµÄ·½·¨ÔÚȫУ³éÈ¡120ÃûѧÉú£¬

Ó¦ÔÚ¸ßÈýÄ꼶³éÈ¡µÄÈËÊýΪ¡Á700£½28Ãû£®¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­7·Ö

(3)Éè¸ßÈýÄ꼶ÄÐÉú±ÈÅ®Éú¶àµÄʼþΪA£¬¸ßÈýÄ꼶ÄÐÉú¡¢Å®ÉúÊý¼ÇΪ(y£¬z)£®

ÓÉ(2)Öªy£«z£½700£¬ÇÒy£¬z¡ÊN,y¡Ý345£¬z¡Ý345.¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­8·Ö

»ù±¾Ê¼þ¿Õ¼ä°üº¬µÄ»ù±¾Ê¼þÓУº(345,355)¡¢(346,354)¡¢(347,353)¡¢(348,352)¡¢(349,351)¡¢(350,350)¡¢(351,349)¡¢(352,348)¡¢(353,347)¡¢(354,346)¡¢(355,345)¹²11¸ö£¬¡­¡­¡­10·Ö

ʼþA°üº¬µÄ»ù±¾Ê¼þÓУº(351,349)¡¢(352,348)¡¢(353,347)¡¢(354,346)¡¢(355,345)¹²5¸ö£®

¡àP(A)£½ . ¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­13·Ö