ÓÚD£®ÔòÏÒADµÄ³¤ÊÇ¡££®

y 2 O A B x A O D

B 1 µÚ22Ìâͼ C

µÚ25Ìâͼ

µÚ24Ìâͼ

¶þ¡¢£¨¹²8·Ö£©

26¡¢ÎªÖ´ÐÐÖÐÑë¡°½ÚÄܼõÅÅ£¬ÃÀ»¯»·¾³£¬½¨ÉèÃÀÀöÐÂÅ©´å¡±µÄ¹ú²ß£¬ÎÒÊÐij´å¼Æ»®½¨ÔìA¡¢BÁ½ÖÖÐͺŵÄÕÓÆø³Ø¹²20¸ö£¬ÒÔ½â¾ö¸Ã´åËùÓÐÅ©»§µÄȼÁÏÎÊÌ⣮Á½ÖÖÐͺÅÕÓÆø³ØµÄÕ¼µØÃæ»ý¡¢Ê¹ÓÃÅ©»§Êý¼°Ôì¼Û¼ûÏÂ±í£º ÐͺŠռµØÃæ»ý (µ¥Î»:m2/¸ö ) 15 20 ʹÓÃÅ©»§Êý (µ¥Î»:»§/¸ö) 18 30 Ôì¼Û (µ¥Î»: ÍòÔª/¸ö) 2 3 A B ÒÑÖª¿É¹©½¨ÔìÕÓÆø³ØµÄÕ¼µØÃæ»ý²»³¬¹ý365m2£¬¸Ã´åÅ©»§¹²ÓÐ492»§£®

(1)Âú×ãÌõ¼þµÄ·½°¸¹²Óм¸ÖÖ?д³ö½â´ð¹ý³Ì£® (2)ͨ¹ý¼ÆËãÅжϣ¬ÄÄÖÖ½¨Ôì·½°¸×îÊ¡Ç®£®

Èý¡¢£¨¹²10·Ö£©

27£®Èçͼ£¬ÒÑÖªABÊÇ¡ÑOµÄÖ±¾¶£¬µãCÔÚ¡ÑOÉÏ£¬¹ýµãCµÄÖ±ÏßÓëABµÄÑÓ³¤Ïß½»ÓÚµãP£¬AC?PC£¬?COB?2?PCB£®

£¨1£©ÇóÖ¤£ºPCÊÇ¡ÑOµÄÇÐÏߣ» £¨2£©ÇóÖ¤£ºBC?AB£»

£¨3£©µãMÊÇABµÄÖе㣬CM½»ABÓÚµãN£¬ÈôAB?4£¬ÇóMN 2MCµÄÖµ£®

ËÄ¡¢£¨¹²12·Ö£©

28¡¢Èçͼ£¨1£©£¬ÔÚƽÃæÖ±½Ç×ø±êϵÖУ¬¶þ´Îº¯Êýy?ax2?bx?c(a?0)µÄͼÏóµÄ¶¥µãΪDµã£¬ÓëyÖá½»ÓÚCµã£¬ÓëxÖá½»ÓÚA¡¢BÁ½µã£¬ AµãÔÚÔ­µãµÄ×ó²à£¬BµãµÄ×ø±êΪ£¨3£¬0£©£¬OB£½OC £¬tan¡ÏACO£½£® £¨1£©ÇóÕâ¸ö¶þ´Îº¯ÊýµÄ±í´ïʽ£®

£¨2£©¾­¹ýC¡¢DÁ½µãµÄÖ±Ïߣ¬ÓëxÖá½»ÓÚµãE£¬ÔÚ¸ÃÅ×ÎïÏßÉÏÊÇ·ñ´æÔÚÕâÑùµÄµãF£¬Ê¹ÒÔµãA¡¢C¡¢E¡¢FΪ¶¥µãµÄËıßÐÎΪƽÐÐËıßÐΣ¿Èô´æÔÚ£¬ÇëÇó³öµãFµÄ×ø±ê£»Èô²»´æÔÚ£¬Çë˵Ã÷ÀíÓÉ£® £¨3£©ÈôƽÐÐÓÚxÖáµÄÖ±ÏßÓë¸ÃÅ×ÎïÏß½»ÓÚM¡¢NÁ½µã£¬ÇÒÒÔMNΪֱ¾¶µÄÔ²ÓëxÖáÏàÇУ¬Çó¸ÃÔ²°ë¾¶µÄ³¤¶È£®

£¨4£©Èçͼ£¨2£©£¬ÈôµãG£¨2£¬y£©ÊǸÃÅ×ÎïÏßÉÏÒ»µã£¬µãPÊÇÖ±ÏßAGÏ·½µÄÅ×ÎïÏßÉÏÒ»¶¯µã£¬µ±µãPÔ˶¯µ½Ê²Ã´Î»ÖÃʱ£¬¡÷APGµÄÃæ»ý×î´ó£¿Çó³ö´ËʱPµãµÄ×ø±êºÍ¡÷APGµÄ×î´óÃæ»ý.

1312A

C O N B M

E _ A _ _ O y _ y _

B _ _ xC _ D _ _ £¨1£©

C _ A _ _ £¨O _ 2£© D _

2018-2019Äê×îÐÂËÄ´¨³É¶¼ÊÐʵÑéÍâ¹úÓïѧУ×ÔÖ÷ÕÐÉú¿¼ÊÔ

ÊýѧģÄ⾫ƷÊÔ¾í´ð°¸

£¨µÚÈýÌ×£©

1.D 2.B 3.A 4.A 5.C 6.D 7.C 8.D 9.B 10.C 11.

541 12.0 13.2 14.2¡Ç 41?11?015.£¨1£©½â£º?????2009?|?25|?20 ?6??6?1?25?25 ?5£®¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­(6·Ö)

£¨2£©½â£ºÔ­Ê½=(2·Ö)

4x?4x??¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­

(x?4)(x?4)2x?42x?¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­(3·Ö) x?4x?4x?2 £½¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­

x?4 =

(4·Ö) µ±

x?3ʱ£¬Ô­Ê½=

5¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­¡­(6·Ö) 72)£¬BA¡ÍxÖáÓÚA£¬ 16£®½â£º£¨1£©?µãB(4£¬?OA?4£¬BA?2£¬

C y D B 1 O 1 O? ?tan?BOA?AB21??£® 2222 £¨2·Ö£© OA42£¨2£©Èçͼ£¬ÓÉÐýת¿ÉÖª£ºCD?BA?2£¬OD?OA?4£¬ 4)£® 2222 £¨4·Ö£© ?µãCµÄ×ø±êÊÇ(?2£¬A B? A? x £¨3£©¡÷O?A?B?ÈçͼËùʾ£¬

O?(?2£¬?4)£¬A?(2£¬?4)£® 22222 £¨6·Ö£©