¡¾ÃûʦÍƼö¡¿2018-2019ѧÄ껪ʦ´ó°æ°ËÄ꼶ÊýѧÉϲᡶȫµÈÈý½ÇÐÎÖг£¼ûµÄ¸¨ÖúÏßµÄ×÷·¨¡·×¨Ìâ¼°´ð°¸

»ª¶«Ê¦´ó°æ°ËÄ꼶ÊýѧÉÏ²á µÚ13Õ ȫµÈÈý½ÇÐÎ È«µÈÈý½ÇÐÎÎÊÌâÖÐ

³£¼ûµÄ¸¨ÖúÏßµÄ×÷·¨ רÌâ¼ì²âÌâ

1£®ÔÚ¡÷ABCÖУ¬AB£½8£¬AC£½6£¬ÔòBC±ßÉϵÄÖÐÏßADµÄÈ¡Öµ·¶Î§ÊÇ( ) A£®6£¼AD£¼8 B£®2£¼AD£¼14 C£®1£¼AD£¼7 D£®ÎÞ·¨È·¶¨

2£®Èçͼ£¬ÔÚ¡÷ABCÖУ¬ADΪBCÉϵÄÖÐÏߣ¬EΪACµÄÒ»µã£¬BEÓëAD½»ÓÚµãF£¬ÈôAE£½EF.ÇóÖ¤£ºAC£½BF.

3£®Èçͼ£¬ÔÚ¡÷ABCÖУ¬AD½»BCÓÚµãD£¬µãEÊÇBCµÄÖе㣬EF¡ÎAD½»CAµÄÑÓ³¤ÏßÓÚµãF£¬½»ABÓÚµãG.ÈôBG£½CF£¬ÇóÖ¤£ºADΪ¡÷ABCµÄ½Çƽ·ÖÏߣ®

4£®Èçͼ£¬CE£¬CB·Ö±ðÊÇ¡÷ABC£¬¡÷ADCµÄÖÐÏߣ¬ÇÒAB£½AC.ÇóÖ¤£ºCD£½2CE.

5£®Èçͼ£¬ÔÚ¡÷ABCÖУ¬¡ÏB£½60¡ã£¬¡ÏBAC£¬¡ÏACBµÄƽ·ÖÏßAD£¬CE½»ÓÚµãF£¬ÊÔ²ÂÏëAE£¬CD£¬ACÈýÌõÏ߶ÎÖ®¼äµÄÊýÁ¿¹Øϵ£¬²¢¼ÓÒÔÖ¤Ã÷£®

6£®ÒÑÖª£ºÈçͼ£¬ABCDÊÇÕý·½ÐΣ¬¡ÏFAD£½¡ÏFAE.ÇóÖ¤£ºBE£«DF£½AE.

7£®Èçͼ£¬¡÷ABCÊDZ߳¤Îª2µÄµÈ±ßÈý½ÇÐΣ¬BD£½CD£¬¡ÏBDC£½120¡ã£¬E£¬F·Ö±ðÔÚAB£¬ACÉÏ£¬ÇÒ¡ÏEDF£½60¡ã.

(1) Ö¤Ã÷£ºBE£«CF£½EF£»

(2)Çó¡÷AEFµÄÖܳ¤£®

Èý¡¢¹ý½Çƽ·ÖÏßÉÏÒ»µãÏò½ÇÁ½±ß×÷´¹Ïß

8£®Èçͼ£¬ÔÚ¡÷ABCÖУ¬AC£½BC£¬¡ÏACB£½90¡ã£¬

ƽ·Ö¡ÏABC£¬ÇóÖ¤£ºAB£½BC£«CD.

BD

9£®Èçͼ£¬AB£¼BC£¬BDƽ·Ö¡ÏABC£¬AD£½DC£¬ÇóÖ¤£º¡ÏBAD£«¡ÏBCD£½180¡ã.

10£®Èçͼ£¬ÔÚ¡÷ABCÖУ¬¡ÏC£½2¡ÏB£¬¡Ï1£½¡Ï2£¬ÇóÖ¤£ºAB£½AC£«CD.

11£®Èçͼ£¬ÔÚ¡÷ABCÖУ¬¡ÏB£½2¡ÏC£¬ÇÒAD¡ÍBCÓÚD.ÇóÖ¤£ºCD£½AB£«BD.

ÁªÏµ¿Í·þ£º779662525#qq.com(#Ì滻Ϊ@) ËÕICP±¸20003344ºÅ-4