1、 1 初三第一学期期中学业水平调研 数 学 参 考 答 案 2018 11 16 2 1 2 3 4 5 6 7 8 C A B C A D B A 16 2 9 2 20 xx 10 11 5 k 12 110 13 14 2 45.1(1 ) 172.9 x 15 2 16 1 68 17 ( 2) 3( 2) x x x ( 2) 3( 2) 0 x x x ( 2)( 3) 0 xx 20 x 30 x 1 2 x 2 3 x 2 60 xx . 2 4 25 b ac . 2 4 1 5 22 b b ac x a , 1 2 x 2 3 x 18 ABC B DBE ABC DBE
2、 BA=BD A= ADB A= BDE ADB = BDE DB ADE E D C B A 2 D C l O B A 2a 3.2a 0.8a E19 解： 1 2 20 1 2 0 x ax b 10 ab 1 ab 22 2 a b b ( )( ) 2 a b a b b 2 a b b ab 1 21 OC 0.8 3.2 2 6 AB a a a a 3 OC OB a OE OB BE a AB CD E 2 CD CE . Rt OCE 2 2 2 2 (3 ) 2 2 CE OC OE a a a 42 CD a 22 1 2 y x ax b ( 2 0) ( 1 3)
3、 AB 4 2 0 1 3. ab ab 6 8. a b D C O B A 3 5 4 D E C F B O A 3 2 1 2 68 y x x 2 (3 1) C 90 BOC 23 1 2 3 3 2 y x x 2 3 1 3 2 2 ( ) 2 b x a y 2 4 9 3 3 42 4 ( ) 2 ac b a 1 3 2 3 2 24 1 OD AB O 90 ADB AD BC . AB AC 12 OA OD 2 ADO 1 ADO OD AC DE AC E = 90 ODF AED OD ED DE O 2 AB AC AD BC 12 CD BD . CD BF
4、 = BF BD 3 F 4 3 2 3 F OB OD 5= 4 2 3 90 ODF 3 30 F 4 5 60 90 ADB 2 1 30 . 2 F DF AD 4 1 30 90 AED 2 AD ED 2 2 2 AE DE AD 3 AE 23 AD 23 DF 25 1 3 x y x 3 x y 3 2 1 33 2 xx y 3 0 a 1 a 2 3 a 1 26 1 1 a 2 2 y x x 0 y 2 20 xx 12 0, 2 xx A B ( 2 0) A (0 0) B 2 2 a 2 22 y x x 0 y 2 2 2 0 xx 12 01 xx A B
5、(0 0) A (1 0) B 2 PB 5 3 x 2 9 2 3 12 c y 12 PC 14 PB PC 5 9 a 2 a 27 1 1 AC OM AP 1 OA OP 60 OAP = 60 OP PA OPA OAP PBC =60 PB PC BPC OPA APB BPC APB OPB APC OBP ACP 60 PAC O OPA PAC AC OM 2 1 4 POR S 28 1 1 P 3 P 2 12 M 18 N A “ ” AM AN A MN MN C AA A x y (1 5) C = =5 A AM AN y =3 CM . N C M P B A O O A B P M C N 6 22 4 AC AM MC A ( 3 5) (5 5) 3 24 t