1、 2017 120 120+20 3 24 1 A B. C D. 2 A B C D 3 100 A 40 40 B 80 20 C 50 50 D 50 50 80 ,20 4 0 x 1 x x 1 x x 2 A x B x 1C x D x 25 3 4 5 4 5 6 2.5 6 6.5 8 15 17 A 4 B 3 C 2 D 1 6 ABC BF CF F DE BC BD+CE=9 DE A 6 B 7 C 8 D 9 7 1 4 9 2 3 4 a b c ( ) A 13 B 26 C 18 D 17 8 BC 3,AC 4,AB 5 AB ABC , CC ( ) A
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3、9 2 3 1 3 ) 1 ( x = - 9 3m 5m 14 20 2 - 0 3 2 2 1 - 5 - - 64 - 11 - 6 21 3 y x y x 2 x+y 2016 6 22 ABCD AD BC E AB DE CB F G BC GDF= ADF 1 ADE BFE 2 EG EG DF 6 23 ABCD ABCD AB 3 m BC 4 m CD 12 m DA 13 m B 90 35 8 24 ABCD BD C C BC AD E AD=8 AB=4 1 BDE 2 DE C 8 25 10m B 20m A D A ? 8 26 (1) ABC BC AC D E BD=CE AD BE F AFE 2 D E CB AC BD=CE AD BE F AFE 8 27 (1) OA OB OAMB _ E _ F _ D _ C _ B _ A A B E F C D A C B (2) ABC B 60 DBE AD DC DCB 30 ABCD 8
