1、 2018 120 120 3 30 1 Rt ABC 2 A A. 2 B. 2 1C. 4 D. 2 x 2 4x 2 0 A. (x 2) 2 2 B. (x 2) 2 2 C. (x 2) 2 2 D. (x 2) 2 6 3 ABC A B C B A AB 4 3 ABC 15cm A B C A. 18 B. 20 C. 4 15D. 3 804 S 2 2.3 S 2 2.1 S 2 1.9 S 2 1.3 A. B. C. D. 5 B y x 2 x 0 B x A BO OAB A. 1 B. 2 C. 3 D.4 6 x 2 3x 1 0 A. B. C. D. 7 s
2、in 5 3 cos 90 A. 5 4B. 5 3C. 4 3D. 3 48 A 3 6 B 9 3 O 3 1 ABO A A A. 1 2 B. 9 18 C. 9 18 9 18 D. 1 2 1 2 9 sin cos m sin cos n A. m n B. m 2n 1 C. m 2 2n 1 D.m 2 1 2n 10 A 1 y1 B 1 y2 C 2 y3 y x 5 y1 y2 y3 A. y1 y2 y3 B. y2 y3 y1 C. y3 y2 y1 D. 3 30 11 b a 3 2 b a a 12 y m 1 x m 2 m 13 2x x 3 5 x 2
3、7 14 1.5m 1m 20m m 15 1600 80 78 16 Rt ABC C 90 sinA 5 3 sinB 17 x 1 x 2 x 2 5x 2 0 x 1 x 2 x 1x 2 18 4m m 19 ABC , BC 12cm, AD 6cm, x PQMN BC AB AC x cm 19 20 20 , y 1 1 1 k1x b y2 x k 2 A 1 2 B 2 1 y1 y2 x 60 21 4 sin30 cos45 2 0 ( 1) 2017 3tan30 4sin 2 60 ( 3 1 ) 222 8 1 3x 2 10x 6 0 2 2(x 3) 3x(
4、x 3) 23 6 A C 60 6 B 30 6 24 8 ABCD E F AD CD AE=ED DF= 4 1 DC EF BC G 1 ABE DEF 2 4 BG 25 8 3 30 2500 100 50.5 60.5 16 0.08 60.5 70.5 40 0.2 70.5 80.5 50 0.25 80.5 90.5 m 0.35 90.5 100.5 24 n 1 m= n= 3 2 2 3 70 70 3 26 8 60 300 1 20 40 6080 27 8 AB i=1: 3 E C BC=25 CE=20 E AB 28 10 y= x k 1 y=k2x+b
5、 A m,1 B -2,n OA x 4 1 1 2 AB x C AC x 2017 120 120 3 30 1 5 D A B D A 6 10 B B D C B 3 30 11 5 212 1 13 2x 2 11x 3 0 14 30 15 40 16 5 417 7 18 6 2 5 19 4 20 x 2 0 x 1 60 21 4 1 1 3 3 3 4 2 3 2 9 1 3 9 5 22 8 1 a 3 b 10 c 6 b 2 4ac 100 4 3 6 28 0 x 6 28 10 x 1 3 7 5 x 2 3 7 5 2 2 x 3 3x x 3 0 x 3 2
6、3x 0 x 3 0 2 3x 0 x 1 3 x 2 3 223 C CD AB D CAB 30 ABC 120 ACB 30 CBD 60 BC AB 6 Rt BCD sin CBD sin60 BC CD CD BC sin60 6 2 3 3 3 3 3 6 24 1 DF 4 1 DC AE ED ABCD DF AE 1 2 DE AB 1 2 DF AE DE AB A D 90 ABE DEF 2 ABCD AD 4 ED CG DEF CGF FC DF CG ED 3 1 CG 2 3 1 CG 6 BD BC CH 4 6 10 25 1 200 m 70 n 0.1
7、2 2 3 2500 0.08 0.2 700 700 26 x x 40 300 20 60 x 6080 x 1 56 x 2 59 x 56 56 x 60 x 40 300 20x 6080 x 1 4 x 2 1 x 4 60 4 56 56 27 E EF BC F EN AB N i 1: 3 EF x FC 3 CE 20 x 2 3 x 2 400 x 10 FC 10 3 BC 25 BF NE 25 10 3 AEN 45 AN EN 25 10 3 AB AN BN NE EF 10 25 10 3 35 10 3 AB 35 10 3 28 1 A AE x E tan AOE tan 4 1 OE 4AE A m 1 AE 1 OE m 4 A 4 1 A y x k 1 K1 4 y x 4 B 2 n y n 2 B 2 2 A B y k2x b 4k2 b 1 k2 2 1 2k2 b 2 b 1 AB y 2 1 x 1 2 y 2 1 x 1 y 0 x 2 C 2 0 A 4 1 CE 2 AE 1 tan CE AE
