1、 2017-2018 26 150 120 1. 2. 3. 12 4 48 1 A 2cm 4cm 6cm B 8cm 6cm 4cm C 14cm 6cm 7cm D 2cm 3cm 6cm 2 A -3,5 x A (-3, 5) B (3,-5) C (- 3,- 5) D (3, 5) 3 . A. 3 4 12 a a a B. 3 3 6 2 a a a C. 33 0 aa D. 2 3 5 3 5 15 x x x 4 5CM 3CM A 8CM B.13CM C. 13CM 11CM D.11CM 5 A B C D 6 . A. 9 2 a B. 2 2 y x C. 2
2、 2 b a D. 4 4 b a 7 1, ABC AB=AC=BC,CD ACB , D DE BC AC E, ABC a, ADE ( ). A.2a B. 3 4 a C. 2 3 a D.a E D C A B H F 1 2 8 2 Rt ABC CD AB AE CD H EF AB F . A ACD B B CH=HD C CH=CE=EF D AC=AF 9 x 2 +2ax+25 a . A.5 B.10 C.5 5 D.10 10 10 ABC AD AB=8CM AC=6CM ACD ABD S S : A 4:3 B.3:4 C.16:9 D.9:16 11 7
3、ABE ADC ABC AB AC A B C D 12 4 P AOB MPN AOB MPN P OA OB M N 1 PM PN 2 OM ON 3 PMON 4 MN . A 4 B 3 C 2 D 1 N M A O B P 3 4 4 24 13 x 4 x-4 0 . 14 _ 15 A a,2017 B 2018 b y a+b= . 16 A,B B A 5 8 . 17 6 AMN 18 B C O, O MN BC 5 6 AB,AC M,N. AB+AC= . 18 6 AD BC AB BC CD DE DF BC CD=ED AD=2 FC=1 ADE 2 19
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