È˽̰æ°ËÄê¼¶ÉϲáÊýѧÆÚÄ©¿¼ÊÔÊÔ¾í¼°´ð°¸ ÏÂÔØ±¾ÎÄ

È˽̰æ°ËÄê¼¶£¨ÉϲᣩÊýѧÄêÖÕ²âÊÔ¾í¼°´ð°¸

£¨±¾¼ì²âÌâÂú·Ö£º120·Ö£¬Ê±¼ä£º90·ÖÖÓ£©

ÌâºÅ µÃ·Ö ÆÀ·Ö ÔľíÈË Ò» ¶þ Èý ×Ü·Ö Ò»¡¢Ñ¡ÔñÌ⣨ÏÂÁи÷ÌâËù¸ø´ð°¸ÖУ¬ÖÐÓÐÒ»¸ö´ð°¸ÊÇÕýÈ·µÄ¡£Ã¿Ð¡Ìâ3·Ö£¬¹²36·Ö£©

1£®ÒÑÖªÈý½ÇÐÎÁ½±ßµÄ³¤·Ö±ðÊÇ5ºÍ9£¬Ôò´ËÈý½ÇÐεÚÈý±ßµÄ³¤¿ÉÄÜÊÇ£¨ £©

£Á£®1 £Â£®4 £Ã£®8 £Ä£®14 2£®ÏÂÁÐͼÐζ¼ÖУ¬²»ÊÇÖá¶Ô³ÆÍ¼ÐεÄÊÇ ( )

¢Ù ¢Ú ¢Û ¢Ü ¢Ý

£Á£®¢Ù¢Ý £Â£®¢Ú¢Ý £Ã£®¢Ü¢Ý £Ä£® ¢Ù¢Û 3£®ÏÂÁÐÔËËãÕýÈ·µÄÊÇ( )

£Á7a2b?5a2b?2£Â£®x8?x4?x2£Ã£¬(a?b)2?a2?b2 £Ä£®?2x2??8x6

34.ÈôµãA£¨£­3£¬2£©¹ØÓÚÔ­µã¶Ô³ÆµÄµãÊǵãB£¬µãB¹ØÓÚxÖá¶Ô³ÆµÄµãÊǵãC£¬ÔòµãCµÄ×ø±êÊÇ£¨ £©

A.£¨3£¬2£© B£®£¨£­3£¬2£© C£®£¨3£¬£­2£© D£®£¨£­2£¬3£© 5£®°Ñ¶àÏîʽa2?4a·Ö½âÒòʽ£¬½á¹ûÕýÈ·µÄÊÇ( )

(a?2)2?4 £Á£®a(a?4) £Â£®a(a?2)(a?2) £Ä£®(a?2)(a?2) £Ã£®

6£®Èç¹ûµ¥Ïîʽ?x4a?by2Óëx3ya?bÊÇͬÀàÏÄÇôÕâÁ½¸öµ¥ÏîʽµÄ»ýÊÇ( )

£Á£®x6y4 £Â£®?x3y2 £Ã£®?x3y2 £Ä£®?x6y4

?C?76o£¬7£®Èçͼ£¬AE¡¢AD·Ö±ðÊÇ?ABCµÄ¸ßºÍ½Çƽ·ÖÏߣ¬ÇÒ?B?36o£¬

138313Ôò?DAE µÄ¶ÈÊýΪ£¨ £©

£Á£®40o £Â£®20o £Ã£®18o £Ä£®38o

ADC

B

DEµÚ7ÌâCAµÚ8ÌâBµÚ9Ìâ

8£®Èçͼ£¬ÏÂÁи÷×éÌõ¼þÖУ¬²»Äܵõ½¡÷ABC¡Õ¡÷BADµÄÊÇ£¨ £© £Á£®BC?AD£¬?ABC??BAD £Â£®BC?AD£¬AC?BD

£Ã£®AC?BD£¬?CAB??DBA £Ä£®BC?AD£¬?CAB??DBA 9£®Èçͼ£¬ÔÚ?ABCÖУ¬?C?90o£¬AC?BC£¬ADƽ·Ö?CAB£¬½»BCÓÚµãD£¬DE?ABÓÚµãE£¬ÇÒAB?6cm£¬Ôò?DEBµÄÖܳ¤Îª( ) £Á£®4cm £Â£®6cm £Ã£®10cm £Ä£®²»ÄÜÈ·¶¨

a2?aa2?110£® »¯¼òµÄ½á¹ûÊÇ( ) ?a?1a2?2a?1a £Ã£®£Á£® £Â£®

1aa?1a?1 £Ä£® a?1a?111. Èçͼ£¬C¡¢EºÍB¡¢D¡¢F·Ö±ðÔÚ¡ÏGAHµÄÁ½±ßÉÏ£¬ÇÒAB = BC = CD = DE = EF£¬Èô¡ÏA =18¡ã£¬Ôò¡ÏGEF

EGCABDFHµÄ¶ÈÊý

ÊÇ£¨ £©

A£®108¡ã B£®100¡ã C£®90¡ã D£®80

12£®¼×³µÐÐÊ»30ǧÃ×ÓëÒÒ³µÐÐÊ»40ǧÃ×ËùÓÃʱ¼äÏàͬ£¬ÒÑÖªÒÒ³µÃ¿Ð¡Ê±±È¼×³µ¶àÐÐÊ»15ǧÃ×£¬Éè¼×³µµÄËÙ¶ÈΪxǧÃ×/Сʱ£¬ÒÀÌâÒâÁз½³ÌÕýÈ·µÄÊÇ£¨ £© £Á£®30£½

x40 x?15£Â£®

30£½40 xx?15£Ã£®30£½

x40 x?15£Ä£®

30£½40 xx?15ÆÀ·Ö ÔľíÈË ¶þ¡¢Ìî¿ÕÌâ(ÿСÌâ3·Ö£¬¹²18·Ö)

13. ¼ÆË㣺£¨2+3x£©£¨£­2+3x£©=__________.

14£®Èçͼ£¬µãDÔÚBCÉÏ£¬DE?ABÓÚµãE£¬DF?BC½»ACÓÚµãF£¬

BD?CF£¬BE?CD£®Èô?AFD?145o£¬Ôò?EDF? £®

µÚ14Ìâ

15£®Ò»¸ö¶à±ßÐεÄÄڽǺ͵ÈÓÚËüµÄÍâ½ÇºÍµÄ3±¶£¬ËüÊÇ _±ßÐÎ. 16£®·Ö½âÒòʽ£ºx3?4xy2?

017¡¢µÈÑüÈý½ÇÐεÄÒ»¸ö½ÇÊÇ70£¬ÔòËüµÄÁíÍâÁ½¸ö½ÇµÄ¶ÈÊý

ÊÇ £»

18.Èçͼ£¬?ACDÊÇ?ABCµÄÍâ½Ç£¬?ABCµÄƽ·ÖÏßÓë?ACDµÄƽ·ÖÏß½»ÓÚµãA1£¬?A1BCµÄƽ·ÖÏßÓë?A1CDµÄƽ·ÖÏß½»ÓÚµãA2£¬¡­£¬?An?1BCµÄƽ·ÖÏßÓë?An?1CDµÄƽ·ÖÏß½»ÓÚµãAn£®Éè?A??£¬Ôò?A2? £¬

?An?

ÆÀ·Ö

ÔľíÈË µÚ18Ìâ