九年級(jí)數(shù)學(xué)下冊(cè)《三角函數(shù)》專(zhuān)題提優(yōu)練習(xí)(含答案解析)

《三角函數(shù)》專(zhuān)題提優(yōu)練習(xí)ABCD2ACDFGFGcosEFGA

B

C

DBACA

B1C

DABCDEFGHGHADABBC4AFEEAABQMBA

B1C第1頁(yè)（共頁(yè)）

DByOBtanA3B4DECDFBCFC2BFAD3AEFABCDABtan1BCAODABCD6ABCDBEA'sinABE第2頁(yè)（共頁(yè)）10ABBBCMABMEEMD90BABCsinA13AB4BMDABBM，DEEFDEBMyyx第3頁(yè)（共頁(yè)）參考答與試題解析一選題共小題ABCD2ACDFGFGcosEFGA

B

C

DGNADMDMEeq\o\ac(△,Rt)GMEeq\o\ac(△,Rt)eq\o\ac(△,Rt)DMAN的EFGABNMBDABCDAB2CDADDCAMDCDEMEADDMCMEDMEADME

DM第4頁(yè)（共頁(yè)）222222222222222AGeq\o\ac(△,Rt)GMEGE+MEGE2++GEeq\o\ac(△,Rt)A60AGAN2C60DE160eq\o\ac(△,Rt)EFBEF+2EF．NFAFNFeq\o\ac(△,Rt)GNFGF

EFGcos

C第5頁(yè)（共頁(yè)）22BACA

B1C

DBCABABCBCBCABBCBACtan1ABCDEFGHGHADABBC4AFEE第6頁(yè)（共頁(yè)）EFADEHCDAEHACDEH3xAH4HGGF3ADFAGFAG

FAGAABQMBA

B1C

DAPQMBtanPAQQMB2

PQ2

BQ4

第7頁(yè)（共頁(yè)）222AODOBCAODAOD222AODOBCAODAODQPBQMBtanD

2QPBByOBtanA3B4DBCxDSA△

OAeq\o\ac(△,Rt)AODeq\o\ac(△,Rt)2k2△eq\o\ac(△,S)xADD△eq\o\ac(△,Rt)AOB

OBOAAOD+BOCAOD+第8頁(yè)（共頁(yè)）2OBCAOD2OBCAODeq\o\ac(△,Rt)AODeq\o\ac(△,Rt)OBC222△△kkk4yk0yk二填題共小題ECDFBCFC2BFAD3AEFAFCCD2AD3FCBFFCEAFFEeq\o\ac(△,)AEFABCDBCCDAD第9頁(yè)（共頁(yè)）FC2BF1FC2FCCDCEABFFCEAFFE90CFE9018090AEF45

ABCDABtan第0頁(yè)（共頁(yè)）CDDOBOBODBOBBEDEBEO

ODBDBOBODAMACAHCHNHNLNLO90NOLNOLa

NL

第1頁(yè)（共頁(yè)）LMBODNOL

3AEEFAEBODAE

EF

a

90tanBOD

第2頁(yè)（共頁(yè)）1BCAODBKOKO13OFOFeq\o\ac(△,Rt)BOFBECKBFCKBEBECKCFKOBKAC1KOKF2KOOFCFeq\o\ac(△,Rt)OBFBOF

AODBOFAOD第3頁(yè)（共頁(yè)）2222ABCD610EA'CCBEA'EABAB6'E90BACeq\o\ac(△,Rt)'ACAExAExDE10ACeq\o\ac(△,Rt)CDExx2eq\o\ac(△,Rt)

+368+2

sinABE

AE10ABBBCMABME90cosDMCBDE第4頁(yè)（共頁(yè)）22222222222222222DMABCDAD2HAMBMHMBADHB2EMDHEHEDBExADEADABDEAD2xx1

1

1+3101OB第5頁(yè)（共頁(yè)）22222222222220AOBOA+310AB1+4OA

AB

AB90AOBcos45

121sinABCBCADBCDABEAB2

2

AD

ABCBCADABCECE第6頁(yè)（共頁(yè)）A13AB4BMDABBM，DEEFDE