ÌâÄ¿ÄÚÈÝ
2£®Ä³Ð£ÎªÁ˽â¸ßÈýÄ꼶²»Í¬ÐÔ±ðµÄѧÉú¶ÔÈ¡ÏûÒÕÊõ¿ÎµÄ̬¶È£¨Ö§³Ö»ò·´¶Ô£©£¬½øÐÐÁËÈçϵĵ÷²éÑо¿£®È«Ä꼶¹²ÓÐ1350ÈË£¬ÄÐÅ®Éú±ÈÀýΪ8£º7£¬ÏÖ°´·Ö²ã³éÑù·½·¨³éÈ¡Èô¸ÉÃûѧÉú£¬Ã¿È˱»³éµ½µÄ¸ÅÂʾùΪ$\frac{1}{9}$£¬Í¨¹ý¶Ô±»³éȡѧÉúµÄÎʾíµ÷²é£¬µÃµ½ÈçÏÂ2x2ÁÐÁª±í£ºÖ§³Ö | ·´¶Ô | ×Ü¼Æ | |
ÄÐÉú | 30 | ||
Å®Éú | 25 | ||
×Ü¼Æ |
£¨Ãó£©Èôij°àÓÐ6ÃûÄÐÉú±»³éµ½£¬ÆäÖÐ2ÈËÖ§³Ö£¬4ÈË·´¶Ô£»ÓÐ4ÃûÅ®Éú±»³éµ½£¬ÆäÖÐ2ÈËÖ§³Ö£¬2ÈË·´¶Ô£¬ÏÖ´ÓÕâ10ÈËÖÐËæ»ú³éÈ¡Ò»ÄÐһŮ½øÒ»²½µ÷²éÔÒò£®ÇóÆäÖÐÇ¡ÓÐÒ»ÈËÖ§³ÖÒ»ÈË·´¶ÔµÄ¸ÅÂÊ£®
²Î¿¼¹«Ê½¼°ÁÙ½ç±í£ºK2=$\frac{n£¨ad-bc£©^{2}}{£¨a+c£©£¨b+d£©£¨a+b£©£¨c+d£©}$
P£¨K2¡Ýk0£© | 0.10 | 0.050 | 0.010 | 0.005 | 0.001 |
k0 | 2.706% | 3.841 | 6.635 | 7.879 | 10.828 |
·ÖÎö £¨¢ñ£©ÀûÓÃËù¸øÊý¾Ý£¬¿ÉÒÔÍê³ÉÁÐÁª±í£»Çó³ök0£¬ÓëÁÙ½çÖµ±È½Ï£¬¼´¿ÉµÃ³öÄÜ·ñÓÐ99.9%µÄ°ÑÎÕÈÏΪ̬¶ÈÓëÐÔ±ðÓйأ»
£¨¢ò£©È·¶¨»ù±¾Ê¼þµÄ¸öÊý£¬¸ù¾Ý¸ÅÂʹ«Ê½£¬¿ÉµÃ½áÂÛ£®
½â´ð ½â£º£¨¢ñ£©ÁÐÁª±íÈçÏ£º
Ö§³Ö | ·´¶Ô | ×Ü¼Æ | |
ÄÐÉú | 30 | 50 | 80 |
Å®Éú | 45 | 25 | 70 |
×Ü¼Æ | 75 | 75 | 150 |
ËùÒÔûÓÐ99.9%µÄ°ÑÎÕÈÏΪ̬¶ÈÓëÐÔ±ðÓйأ®¡£¨6·Ö£©
£¨¢ò£©Ëæ»ú³éÈ¡Ò»ÄÐһŮËùÓпÉÄܵÄÇé¿öÓÐ24ÖÖ£¬ÆäÖÐÇ¡ÓÐÒ»ÈËÖ§³ÖÒ»ÈË·´¶ÔµÄ¿ÉÄÜÇé¿öÓÐ2¡Á2+4¡Á212ÖÖ£¬ËùÒÔ¸ÅÂÊΪP=$\frac{1}{2}$£®¡£¨12·Ö£©
µãÆÀ ±¾Ì⿼²é¸ÅÂÊ֪ʶµÄÔËÓ㬿¼²é¶ÀÁ¢ÐÔ¼ìÑé֪ʶ£¬È·¶¨»ù±¾Ê¼þÊǹؼü£®
Á·Ï°²áϵÁдð°¸
Ïà¹ØÌâÄ¿
13£®ÊýÁÐ{an}ÖУ¬Âú×ãan+2=2an+1-an£¬ÇÒa1£¬a4031ÊǺ¯Êýf£¨x£©=$\frac{1}{3}{x^3}-4{x^2}+6x-1$µÄ¼«Öµµã£¬Ôòlog2a2016µÄÖµÊÇ£¨¡¡¡¡£©
A£® | 2 | B£® | 3 | C£® | 4 | D£® | 5 |
10£®¿ÕÆøÎÛȾ£¬ÓÖ³ÆΪ´óÆøÎÛȾ£¬ÊÇÖ¸ÓÉÓÚÈËÀà»î¶¯»ò×ÔÈ»¹ý³ÌÒýÆðijЩÎïÖʽøÈë´óÆøÖУ¬³ÊÏÖ³ö×ã¹»µÄŨ¶È£¬´ïµ½×ã¹»µÄʱ¼ä£¬²¢Òò´ËΣº¦ÁËÈËÌåµÄÊæÊÊ¡¢½¡¿µºÍ¸£Àû»ò»·¾³µÄÏÖÏó£®È«ÊÀ½çÒ²Ô½À´Ô½¹Ø×¢»·¾³±£»¤ÎÊÌ⣮µ±¿ÕÆøÎÛȾָÊý£¨µ¥Î»£º¦Ìg/m3£©Îª0¡«50ʱ£¬¿ÕÆøÖÊÁ¿¼¶±ðΪһ¼¶£¬¿ÕÆøÖÊÁ¿×´¿öÊôÓÚÓÅ£»µ±¿ÕÆøÎÛȾָÊýΪ50¡«100ʱ£¬¿ÕÆøÖÊÁ¿¼¶±ðΪ¶þ¼¶£¬¿ÕÆøÖÊÁ¿×´¿öÊôÓÚÁ¼£»µ±¿ÕÆøÎÛȾָÊýΪ100¡«150ʱ£¬¿ÕÆøÖÊÁ¿¼¶±ðΪÈý¼¶£¬¿ÕÆøÖÊÁ¿×´¿öÊôÓÚÇá¶ÈÎÛȾ£»µ±¿ÕÆøÎÛȾָÊýΪ150¡«200ʱ£¬¿ÕÆøÖÊÁ¿¼¶±ðΪËļ¶£¬¿ÕÆøÖÊÁ¿×´¿öÊôÓÚÖжÈÎÛȾ£»µ±¿ÕÆøÎÛȾָÊýΪ200¡«300ʱ£¬¿ÕÆøÖÊÁ¿¼¶±ðΪÎ弶£¬¿ÕÆøÖÊÁ¿×´¿öÊôÓÚÖضÈÎÛȾ£»µ±¿ÕÆøÎÛȾָÊýΪ300ÒÔÉÏʱ£¬¿ÕÆøÖÊÁ¿¼¶±ðΪÁù¼¶£¬¿ÕÆøÖÊÁ¿×´¿öÊôÓÚÑÏÖØÎÛȾ£®2015Äê8ÔÂijÈÕijʡx¸ö¼à²âµãÊý¾Ýͳ¼ÆÈçÏ£º
£¨¢ñ£©¸ù¾ÝËù¸øͳ¼Æ±íºÍƵÂÊ·Ö²¼Ö±·½Í¼ÖеÄÐÅÏ¢Çó³öx£¬yµÄÖµ£¬²¢Íê³ÉƵÂÊ·Ö²¼Ö±·½Í¼£»
£¨¢ò£©ÔÚ¿ÕÆøÎÛȾָÊý·Ö±ðΪ50¡«100ºÍ150¡«200µÄ¼à²âµãÖУ¬Ó÷ֲã³éÑùµÄ·½·¨³éÈ¡5¸ö¼à²âµã£¬´ÓÖÐÈÎÒâÑ¡È¡2¸ö¼à²âµã£¬Ê¼þA¡°Á½¸ö¶¼ÎªÁ¼¡±·¢ÉúµÄ¸ÅÂÊÊǶàÉÙ£¿
¿ÕÆøÎÛȾָÊý £¨µ¥Î»£º¦Ìg/m3£© | [0£¬50] | £¨50£¬100] | £¨100£¬150][ | £¨150£¬200] |
¼à²âµã¸öÊý | 15 | 40 | y | 10 |
£¨¢ò£©ÔÚ¿ÕÆøÎÛȾָÊý·Ö±ðΪ50¡«100ºÍ150¡«200µÄ¼à²âµãÖУ¬Ó÷ֲã³éÑùµÄ·½·¨³éÈ¡5¸ö¼à²âµã£¬´ÓÖÐÈÎÒâÑ¡È¡2¸ö¼à²âµã£¬Ê¼þA¡°Á½¸ö¶¼ÎªÁ¼¡±·¢ÉúµÄ¸ÅÂÊÊǶàÉÙ£¿
17£®ÔÚÇø¼ä[-2£¬1]ÈÎÈ¡Á½¸öʵÊýx£¬y£¬Ôòx+y£¾0¸ÅÂÊΪ£¨¡¡¡¡£©
A£® | $\frac{2}{9}$ | B£® | $\frac{4}{9}$ | C£® | $\frac{1}{2}$ | D£® | $\frac{7}{9}$ |
7£®ÔÚ¡÷ABCÖУ¬Èô$\sqrt{3}$£¨tanB+tanC£©=tanBtanC-1£¬Ôòsin2A=£¨¡¡¡¡£©
A£® | -$\frac{\sqrt{3}}{2}$ | B£® | $\frac{\sqrt{3}}{2}$ | C£® | -$\frac{1}{2}$ | D£® | $\frac{1}{2}$ |