1、 2018 ( 3 30 ) 1 10 7 11 _. 2 3 2 2 x x y k h x y 2 ) ( y=_. 3 , ABC ,D,E AB,AC (DE BC), , ADE ABC . 4 9 6 5 y= m+1 2 2m x m 6 2 10 _ 7 PA PB O A B E O 60 AEB P_ 7 8 9 8 P ABCD PC=1 CDP C CBE PE=_ . 9 ABC) C AB D EF. AB AC 3 BC 4 B D F ABC CF _ 10 5 50 15 P ( 3 30 ) 11 ( ) C D A B P E P 2 D E AB AC
2、( ) A. AD DB AE ECB. AB DB AC ECC. AD AB AE ACD. AD DB AC BC 2 3 4 3 ABC D E AB AC ABC AED A. AED= B B. ADE= C C. D. 4 , ABC D E F AB AC BC ,DE BC EF AB, AD DB=3 5 CF CB A.5 8 B.3 8 C.3 5 D.2 5 5 A B C D 6 ( ) 1 2 4 9 16 81. , ( ) A 1 B 2 C 3 D 4 7 ABC C=90 AC=BC=4 cm D AB C 4 cm A B C D ( ) A.1 B.2
3、 C.3 D.4 8 x k y A( 7 2 y1) B(5 y2) y1 y2 A y1 y2 B y1 y2 C y1 y2 D 9 . 1.2 1 . 3 - A. 0.36 2B 0.81 2C 2 2D 3.24 210 M BC N AM CM=CN CM BM AN AM A ABM ACB B ANC AMB C ANC ACM D CMN BCA 21. 9 1 ABC O . (1) O ABC 2 A BC (2) A BC B 90 “ “ A B C (3) A BC . 10 A B C N M O A C B 22. 6 ABC AB=8cm BC=16cm P
4、 A AB B 2cm/s Q B BC C 4cm/s P Q PBQ ABC 23. 6 2 1 1 . 1 1 1 24. 8 y=x 2 +bx+c x A 1 0 B 3 0 1 2 3 1 P P S =8 P 25. 5 AB C AO E EC. AB 8 CD 2 EC 26. 8 ABC AB=AC 1= 2. ADB ABE AE AD AB 2 27. 8 , ABC , C=90 ,AD BAC ,O AB , OA O D. 1 BC O 2 BD=5 DC=3 AC 28. 10 AB x y A B OB AB x 2 12x+32=0 (ABOB) C AB C CD x D 1 AB 2 S OBCD=3S C 3 P, P O B . , P ; , . O A B D C
