ÌâÄ¿ÄÚÈÝ
2£®ÏÂÁÐ˵·¨´íÎóµÄÊÇ£¨¡¡¡¡£©A£® | ÉèÓÐÒ»¸ö»Ø¹é·½³ÌΪ$\widehat{y}$=3-5x£¬Ôò±äÁ¿xÿÔö¼ÓÒ»¸öµ¥Î»£¬yƽ¾ùÔö¼Ó5¸öµ¥Î» | |
B£® | »Ø¹éÖ±Ïß$\widehat{y}$=$\widehat{b}$x+$\widehat{a}$±Ø¹ýµã£¨$\overline{x}$£¬$\overline{y}$£© | |
C£® | ÔÚÒ»¸ö2¡Á2ÁÐÁª±íÖУ¬ÓɼÆËãµÃËæ»ú±äÁ¿K2µÄ¹Û²âÖµk=13.079£¬Ôò¿ÉÒÔÔÚ·¸´íÎóµÄ¸ÅÂʲ»³¬¹ý0.001µÄÇ°ÌáÏ£¬ÈÏΪÕâÁ½¸ö±äÁ¿¼äÓйØϵ | |
D£® | ½«Ò»×éÊý¾ÝÖеÄÿ¸öÊý¾Ý¶¼¼ÓÉÏ»ò¼õȥͬһ¸ö³£Êýºó£¬·½²îºã²»±ä |
·ÖÎö ¸ù¾Ý»Ø¹éϵÊýµÄ¼¸ºÎÒâÒ壬¿ÉÅжÏA£»¸ù¾Ý»Ø¹éÖ±Ïß±ØÒªÑù±¾Êý¾ÝÖÐÐĵ㣬¿ÉÅжÏB£»¸ù¾Ý¶ÀÁ¢ÐÔ¼ìÑ飬¿ÉÅжÏC£»¸ù¾Ý·½²îµÄÒâÒ壬¿ÉÅжÏD£®
½â´ð ½â£ºÈô»Ø¹é·½³ÌΪ$\widehat{y}$=3-5x£¬Ôò±äÁ¿xÿÔö¼ÓÒ»¸öµ¥Î»£¬yƽ¾ù¼õÉÙ5¸öµ¥Î»£¬¹ÊA´íÎó£»
»Ø¹éÖ±Ïß$\widehat{y}$=$\widehat{b}$x+$\widehat{a}$±Ø¹ýµã£¨$\overline{x}$£¬$\overline{y}$£©£¬¹ÊBÕýÈ·£»
ÔÚÒ»¸ö2¡Á2ÁÐÁª±íÖУ¬ÓɼÆËãµÃËæ»ú±äÁ¿K2µÄ¹Û²âÖµk=13.079£¾10.828£¬Ôò¿ÉÒÔÔÚ·¸´íÎóµÄ¸ÅÂʲ»³¬¹ý0.001µÄÇ°ÌáÏ£¬ÈÏΪÕâÁ½¸ö±äÁ¿¼äÓйØϵ£¬¹ÊCÕýÈ·£»
½«Ò»×éÊý¾ÝÖеÄÿ¸öÊý¾Ý¶¼¼ÓÉÏ»ò¼õȥͬһ¸ö³£Êýºó£¬Êý¾ÝµÄÀëÉ¢³Ì¶È²»±ä£¬¹Ê·½²îºã²»±ä£¬¹ÊDÕýÈ·£»
¹ÊÑ¡£ºA£®
µãÆÀ ±¾ÌâÒÔÃüÌâµÄÕæ¼ÙÅжÏΪÔØÌ壬¿¼²éÁ˻عé·ÖÎö£¬¶ÀÁ¢ÐÔ¼ìÑ飬·½²îµÈͳ¼Æ֪ʶ£¬ÄѶȲ»´ó£¬ÊôÓÚ»ù´¡Ì⣮
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿
13£®ÔÚ¼«×ø±êϵÖУ¬¹ýµã$£¨2£¬-\frac{¦Ð}{6}£©$ÇÒƽÐÐÓÚ¼«ÖáµÄÖ±Ïߵķ½³ÌÊÇ£¨¡¡¡¡£©
A£® | ¦Ñcos¦È=$\sqrt{3}$ | B£® | ¦Ñcos¦È=-$\sqrt{3}$ | C£® | ¦Ñsin¦È=1 | D£® | ¦Ñsin¦È=-1 |
10£®ÉèÊýÁÐ{an}µÄÇ°nÏîºÍΪSn£¬Áî${T_n}=\frac{{{S_1}+{S_2}+¡+{S_n}}}{n}$£¬³ÆTnΪÊýÁÐa1£¬a2£¬¡£¬anµÄ¡°ÀíÏëÊý¡±£¬ÒÑÖªÊýÁÐa1£¬a2£¬¡£¬a502µÄ¡°ÀíÏëÊý¡±Îª2012£¬ÄÇôÊýÁÐ5£¬a1£¬a2£¬¡£¬a502µÄ¡°ÀíÏëÊý¡±Îª £¨¡¡¡¡£©
A£® | 2008 | B£® | 2014 | C£® | 2012 | D£® | 2013 |
7£®i10=£¨¡¡¡¡£©
A£® | 1 | B£® | -1 | C£® | i | D£® | -i |
8£®ÒÑÖªf£¨x£©=$\left\{\begin{array}{l}{£¨1-2a£©x+3a£¬}&{x£¼1}\\{lnx£¬}&{x¡Ý1}\end{array}\right.$µÄÖµÓòΪR£¬ÄÇôaµÄÈ¡Öµ·¶Î§ÊÇ£¨¡¡¡¡£©
A£® | £¨-¡Þ£¬-1] | B£® | £¨-1£¬$\frac{1}{2}$£© | C£® | [-1£¬$\frac{1}{2}$£© | D£® | £¨0£¬$\frac{1}{2}$£© |