2020年中考專題19銳角三角函數(shù)(共50題)

年中考數(shù)學真題分專題19銳角角函數(shù)（50）一選題共14小）14230A42

B14

C21

D422ABC1A2

√2B2

C2D23CACE2CDa3bAab

Bab

C

??????

D

????????445ABCsinACB

??123??12335A5

√17B5

3C5

4D55ABsinBAC√2A6

√26B26

√C13

√13D1365ABB78DABDE78EBCDEGBC144.512.4ABsin430.73tan430.93A23

B24

C24.5

D257tan15eq\o\ac(△,Rt)ACBCABC30CBABADD15tan152√tan22.5??3(2+3)(23)A21BC2

1D2

2890Cabc2ABcCbtanDbc9?mCD10.75CD45ACDABcos280.880.53AmmC94.8D112.610150AAD1.5BCA

B

????

C

D

????

A2BC4284CA15

B20

C30

D6012xxxcosx+coscosxy1130

222cos2xcosxsin223ycoscosyx4

√√4A1

B2

C3

D413QTTPTQA

200B??????70°

C200sin

200D??????70°

14?BOABAOAOAA4A????????

B4sin

4C????????

D二填題共14小題1560A24nmileP30P

nmile1.73

1??????eq\o\ac(△,??)eq\o\ac(△,)????1??????eq\o\ac(△,??)eq\o\ac(△,)????16AOBsinAOB17ABCDODAC902????

4??3??

18ABCACBDAB43DCB19BCADAB12ABC

m1.2

20?AC50AD

m0.1m0.6421ABBCD8mA52mmsin520.78cos520.611.2822ABCDDCABBC645AD

23AB30C60AC4mm243015601AB

25BCBCβtan2627cos6028sin45三解題共22小題29BA20/E12CEsin150.97tan150.27330CCECDCD5D45AAB251A

231.733160755.5122.2m0.970.4032AACCA687kmkm0.37cos220.401.413310B

1112C3031134D30C20BDCCD21.414335ABCD10m

DEAF240.01m361lAB12AB181C1BC2MMNN

37MNcm9072cmMN1150cm23100cmcm38ABCDAB460PM30PQ1.413395OAD4000303C45CD460B1.7321.414

40AP2600m154001A121P241ABACBC221mACB4558sin580.85cos580.531.6042MNN1M22BCCAAMNMAM3118mMN

33334360P1BP301B2P504440AP30P4512P251.73245ABCAB

BDD46?D

CAF50BD30AMMDtanMC5012CD1.411.7347AB80BAA30B48kmCA26DBABD370.900.6049MNM36.55

M0.60.81AB2MNCABC501