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1、2023 word 2022 1.0.0158 0.001 A.0.015 B.0.016 C.0.01 D.0.02 B 0.0158 0.016 B 2.6 A.B.C.D.A 3 2 1 A 3.A.B.C.D.C A A B B C C D D 2023 word C 4.A.B.C.D.C A B C D C 5.1 7 A.2 6 B.1 7 45 C.45 D.58 D A B C D 2023 word A.2 6 B.1 7 78 28 50 C.58 D.28 33 45 58 58 72 78 58 D 6.420km 10km 1 x km/h A.B.C.D.C x
2、km/h km/h 1 x km/h km/h C 7.8cm 6cm A.96 cm2 B.48 cm2 C.33 cm2 D.24 cm2 D=6cm=6=6 8=24 cm2 D=8.x 3 a A.4 a 2 B.3 a 2 C.3 a 2 D.3 a 2 D 2023 word 3 D 9.ABC BAC 90 AB 2 AC 3 A B BC D C D AC E AE A.B.C.D.A AD=AB=2 B=ADB CE=DE C=CDE ADE=90 AE=x CE=DE=3-x A B BC D AD=AB=2 B=ADB C D CE=DE C=CDE BAC=90 B+C
3、=90 ADB+CDE=90 ADE=90 AD2+DE2=AE2 AE=x CE=DE=3-x 2023 word 22+(3-x)2=x2 AE=A 10.4 7 10 13 A.297 B.301 C.303 D.400 B 100 1 4 4 3 0 2 7 4+3=4+3 1 3 10 4 3 3=4 3 2 4 13 4 3 3 3=4 3 3 n 4+3(n-1)=3n+1 100 3 100+1=301 B 11.x _ 12.l1 l2 l3 l4 l1 l2 l2 l3 1 126o32 2 _ 2023 word l1 l2 l2 l3 1 13.y1 x 1 y2 kx
4、 b 2 1 b _ x 2 y1 y2 2 2 1 y2 kx b x 2 y1 y2 y1 x 1 y2 kx b 2 1 2 1 y2 kx b,y1 x 1 2023 word x 2 y1 y2 2 14.A C OA C y D B ABD _ 4 C OA S ACD=S OCD,S ACB=S OCB,S ABD=S OBD,B BD y S OBD=4 C OA S ACD=S OCD,S ACB=S OCB,S ACD+S ACB=S OCD+S OCB,S ABD=S OBD,B BD y S OBD=8=4,S ABD=4,4.15.A C D B O AC BC AC
5、B 90 CD a tan CBD AD _ 2023 word ACB 90 tan CBD AC BC 2023 word,90 16.4 17.6 5 n/75.5 x 80.5 78 0.05 2023 word 80.5 x 85.5 83 a 85.5 x 90.5 88 0.375 90.5 x 95.5 93 0.275 95.5 x 100.5 98 0.05 1 n a 2 3 n 4 75.5 x 80.5 95.5 x 100.5 75.5 x 80.5 95.5 x 100.5 1 40 0.25 2 3 88.125 4 1=1 2 3 4 1 2 1 2023 w
6、ord 3 4 A1 A2 75.5 x 80.5 B1 B2 95.5 x 100.5 12 8 18.ABCD AB O OA OD E F BF DF 1 DF 2 AB 10 BF 6 ABCD 1 2 2023 word 1 OF 2 1 OF 2 2023 word 19.24 328 A B A B/A/B/16 1200 900 12 1000 750 1 2 A 12 160 B A B w A t w t t w 1 10 14 2 t 4 w 22 700 1 x 24 x 2 w t 160 1 1 x 24 x 16x 12 24 x 328 x 10 24 x 24
7、 10 14 10 14 2 500 w t t 4 w 50 4 22 500 22 700 20.1 Rt ABC C 90 A B C a b c 2023 word 1 2 ABC A B C a b c 2 3 A B A C AC 60m A 75 C 60 A B 1 2 CD AB D AE BC E AE=csinB AE=bsin BCA CD=asinB CD=bsin BAC 1 CD AB D AC BC E Rt ABE 2023 word 2 ABC A B m 21.x 1 y x x 2 4 n x A B A B y C OC OA n 3 D C l G
8、E BE l F CDEF 1 2023 word 2 n 2 3 1 2 3 1 x y x 2 y 0 A B A 1+n 0 B 3+n 0 C 0 n2+2n+3 n+1 n2+2n+3 n 2 n 1 n 2.3 2 C2 y x 1 2+4 A 3 0 B 1 0 C 0 3 D 1 4 C2 x 1 2023 word E C x 1 E 2 3 G 1 3 BE y kx+b y x+1 x 1 y 1+1 2 F 1 2 FG EG DG CG 1 CDEF CE DF CDEF 22.AOB A y C C 0 P AB P y D AO E AD DM AD x M AO
9、 F BE BF 2023 word 1 AOD D 2 P AB P A B M m m D m BE BF m 1 2 D 1 AOB=60 AOC=30 CDA=60 tan30 AC sin60 AD OA=AD OD=OA OD D 2 D 0 a OD a CD a m a FH y H AC PD FH x n m 1 AOB AOB=60 AOC=30 AC y C 0 OC=AOD OD=AD DAO=DOA=30 CDA=60 D AOD OA=OD,OD=OA=2 2023 word D 0 2 0 2 2 D 0 a OD a CD a AOB Rt AOC m m D m BE BF FH y H AC PD FH x 2023 word P A 2023 word m BE BF