Question

£¨±¾Ð¡ÌâÂú·Ö12·Ö£©
¼×ÒÒÁ½¸öѧУ¸ßÈýÄ꼶·Ö±ðΪ1100ÈË£¬1000ÈË£¬ÎªÁËͳ¼ÆÁ½¸öѧУÔÚµØÇø¶þÄ£¿¼ÊÔµÄÊýѧ¿ÆÄ¿³É¼¨£¬²ÉÓ÷ֲã³éÑù³éÈ¡ÁË105ÃûѧÉúµÄ³É¼¨£¬²¢×÷³öÁ˲¿·ÖƵÂÊ·Ö²¼±íÈçÏ£º£¨¹æ¶¨¿¼ÊԳɼ¨ÔÚ[120£¬150]ÄÚΪÓÅÐ㣩
¼×У£º

·Ö×é								[140,150]
ƵÊý	2	3	10	15	15	x	3	1

ÒÒУ£º

·Ö×é								[140,150]
ƵÊý	1	2	9	8	10	10	y	3

  £¨1£©¼ÆËãx£¬yµÄÖµ£¬²¢·Ö±ð¹À¼ÆÁ½ÉÏѧУÊýѧ³É¼¨µÄÓÅÐãÂÊ£»
£¨2£©ÓÉÒÔÉÏͳ¼ÆÊý¾ÝÌîдÏÂÃæ2¡Á2ÁÐÁª±í£¬²¢ÅжÏÊÇ·ñÓÐ97.5%µÄ°ÑÎÕÈÏΪÁ½¸öѧУµÄÊýѧ³É¼¨ÓвîÒì.

	¼×У	ÒÒУ	×ܼÆ
ÓÅÐã
·ÇÓÅÐã
×ܼÆ

¸½£º

	0£®10	0£®025	0£®010
	2£®706	5£®024	6£®635

Answer 1

½â£º£¨1£©ÒÀÌâ¼×У³éÈ¡55ÈË£¬ÒÒУ³éÈ¡50·Ö£¬                ¡­¡­¡­¡­2·Ö
¹Êx=6£¬y="7                                           " ¡­¡­¡­¡­4·Ö
¹À¼Æ¼×УÓÅÐãÂÊΪ
ÒÒУÓÅÐãÂÊΪ                               ¡­¡­¡­¡­6·Ö
£¨2£©

	¼×У	ÒÒУ	×ܼÆ
ÓÅÐã	10	20	30
·ÇÓÅÐã	45	30	75
×ܼÆ	55	50	105

                                                         ¡­¡­¡­¡­8·Ö
                 ¡­¡­¡­¡­10·Ö
ÓÖÒòΪ                                   ¡­¡­¡­¡­11·Ö
¹ÊÓÐ97.5%µÄ°ÑÎÕÈÏΪÁ½¸öѧУµÄÊýѧ³É¼¨ÓвîÒì.         ¡­¡­¡­¡­12·Ö
£¨×¢£ºÎ´¾­¹ý¼ÆË㣬»ò¼ÆËã´íÎó´ð³öÓÐ97.5%µÄ°ÑÎÕÈÏΪÁ½¸öѧУµÄÊýѧ³É¼¨ÓвîÒìµÄͬѧ²»µÃ·Ö.£©

ÂÔ