2022-2023學(xué)年北京市大興區(qū)八年級(jí)（上）期中數(shù)學(xué)試卷

2022-2023(±)

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i.(2^)()

A.B.aC.4>D.ra

2.(2#)W?W3mMH?!()

A.8,6,5B.3,4,8C.4,6,10D.3,3,6

3.(2#)()

A.360°B.540°C.720°D.900"

5.(2^-)M,AB//DE,&B,C,D￡|s]—M±.%ZBCE=55°Z￡=25°,WJ

C.25°D.20°

6.(2^)M,AA/?C=AA'B'C,￡:ZA=36°,ZC=24°,WjZB'?￡()

C.100°D.120°

7.(2^-)Wiai!±i4&M^,WJnélW^:()

A.4B.5C.6D.7

8.(2#)fclffl,￡3X3MjEOTMf?'t’,B&llA,

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A.4B.8C.10D.12

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14.(2#)AABO^iàH?J^,D^BC^fi,DEA.ABTfiE,%AB=8,M

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3

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■()

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.'.AB+AOAD+DE.

HPAB+AO2AD.

25.(6^-)ftl?,?AABC41,BCtfj^ti,DELAB,DFLAC,E,F,

BE=CF.<üE:AD^LABC

A

26.(75>)?EHiOABCD41,ZA+ZC=180°,BD^^ZABC.

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28.(85>)?^M?WxOy't1,&A,B,P>F?|a]->^±.?PMA*

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(1)(2,4),P2(-4,0),Pi(-2,à),P4(1,3)MSTéKlrtSa

2

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2022-2023(±)

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i.(2#)??JBW?c)

A.<B.ac.D.a

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2.(2#)êWHftW()

A.8,6,5B.3,4,8C.4,6,10D.3,3,6

[#0T1

HüWWjrr.

W:A,6+5>8,

B.3+4<8,W#?r

C,4+6=10,

D.3+3=6,

?&ia:A.

3.(2#)SWWrt?W^j()

A.360°B.540°C.720°D.900°

[WrJniiWjrt?M<?-2)180°,élItBIlnT^lH^.

[&?￡]$■-.(5-2)X180°=540°.fala;B.

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4.(2#)ftAABC?ùiàiE^éPj^()

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C,^?^AABCaüBC?à±M,?MW'ê^?;

D,M$,^^△ABC^BCüL±^ift,

A.

^^l'aJ^?nqf?H?Jf^S.

5.(2^-)M,AB//DE,éB,C,D?R—M^±,ZBCE=55°,ZB=25°,M

[winjp>wsüzDsiwmwt4^,

ai^mzD=zB,mm/B

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‘.‘AB//DE,

.‘.ZB=ZD,

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?ftjet:B.

6.(2#)fri?,AABC^AA'B'C,%ZA=36°,ZC=24°,WJZB'é?J?M()

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CC

A.60°B.90°C.100°D.120°

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[W^]M:VAABC^AA’B’C,ZA=36°,ZC=24°,

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D.

7.(2^-)nJWiH?ttl4^?^,MnJjll??()

A.4B.5C.6D.7

[##f]n(?-3)nJt#n-3=5,?fcHln

M.

LW^lW:

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^Wn=7,

M:D.

[?l￥]^ian(n-3)

8.(25>)frira,?3X3ê<jjE;WHf?^,B$IIA,

^?C^ffl+élW?,,KAABCMWH^^,()

A.4B.8C.10D.12

[5HJ?]W?,(DAB^WAABCféià;?AB$&

[W^l?:toH:

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9.(25?,#A(2,3)(2,-3).

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10.(25?100°,40°.

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(D^ié'Nfi^Jg?Bt,100°,0>9100°+100°=200",

40°.

[??Fif?jm&ttwijs?WJAM

180°Jè-Bic&tt.

11.(25?M,aA,BOE&,AC*gBDffl#T*O.%

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15.

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RtAADCWRtASCD41,VZBDC=ZADC=90°,

XVZACD+ZBCD=90°,ZBCD+ZB=90°,

ZACD=ZB,

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13.(2^>)#n?,,^B,F,C,Effl-M±.,AC=DF,AB=DE,^f?&ABC^&DEF,

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ffl#30Om=M&iWWBD=1AB=4,?4^^^.^'^^DEB=

2

90°,^WJfflMftH?^MiWMft?5^nTWZBD￡=30°,ftja#RtABDE^J

ffl-a-30S?4WBE=1BD=2,HPW^.

2

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2

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2

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2

2.

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15.(2#)fêS14'f?AABC?rS,f?aACfi-ê-,ED,tiE,DAB,

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($mM:i4^JAABCFrfisfoU^Clé

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=BE+AE+BC

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=5+4

=9.

9.

16.(2^)M,AABC^AADE<J^üH?^>BDfOCEfflxMP,'?&&AP.T

ffié?iè't’,?BD=CE;?Z￡P(guān)D=60°;?PA^&ZBPE?tlT^>^5;?PE=PA+PD.Ff

?@?.

E

t^i^“SAS,,aJij!E^BAD^^CAE,?Jf#BD=CE-,WWZABD

o

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AP+PD,WM-

(W-^lM-=’:z,ABC^/ZADE^^^M,

.".ZBAC=ZDAE=60°,

ZZBAD=ZCAE,AB=AC,AD=AE,

:./\BAD^/\CAE(SAS),

:.BD=CE,

VABAD^ACAE,

:.ZAEC=ZADB,

?.*ZANE=ZDNP,

kBADZ^CAE,

ZS^BAü—SACAE,

:.XBD'AH^1-CE'AF,

22

‘:BD=CE,

:.AH=AF,

’.’AHZBD,AFZCE,

ZAP^ZBPE,AWtile;

toS,fa￡&PE±MLOE=PD,&&A0,

E

V/\BAD^/SCAE,

:.ZBDA=ZCEA,

\'OE=PD,AE=AD,

:.E\AOE^/\APD(SAS),

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ZPAO=ZDAE=60°,

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\‘PE=PO+OE,

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L&WJ^üzH??ü

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=>t??F?(^68^,￡17-24?,??5#,￡25?6#,￡26,27?,??7#,

￡28?8^-)

17.(5^-)2f?,

Wlè.

WlJJgiàiè?g2xcm,Wf^omw?ijx+2^+2r=20,

[W^lW:iS^^xcm,2xcm,

IR1K?S.Wx+2x+2x=20,

M4Ix=4,

ax=4W,2x=8,

J9flè^Jion,Scm,Jè?ülK:^!4CVH;

18.(5^)

[W1(n-2)*180°I^SOlMS^tB^S,

W.

(fm

t?igJgjtW,(n-2)’180°=2X360°,

WMn=6.

g:6.

[^￥1WM,nMMm

?M￡?à^imftW^360°.

19.(5#)#11?,&A,B,C,D?M^±,AE=BF,EC=FD,AB=CD.

<üE:/\EAC=/\FBD.

EF

ABCD

r##Tl^sRHlAC=BD,mSSS^m/\EAC^^FBD.

LW^lM:’.'AB—CD,

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HPAC=BD,

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[?ff]

20.(5?)￡nK,O,^ZA=10°,ZB^3(F,ZC=60°,

(W-^JW;':ZA0B=ZC0D,

:.ZA+ZB=ZC+ZD,

VZA=70°,ZB=30°,ZC=60°,

.-.70°+30°=60°+ZD,

ZD=40°.

[￡i￥l

21.(5^)E,ZA—ZD,AE=DE.

j￡i?:BD=AC.

[#flf]ftèZA=ZD,AE=DE,ZAEB=ZDEC,“ASA”

^ZABE^/\DCE,fêBE=CE,Bf?O?OODE+BE=AE+CE,)WBD=AC.

[?m?’.'^&AC^^BDfà-^tiE,

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&/XABEWCE+,

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M?#1.?0|△ABE=&DCE.

22.(5^)&HI,AB,CDfà%.T￡O,DE//AB.

(1)^ZBOD^fà^W^OM,^.DE^^F(^:RWéS,

W);

(2)^ZD=60°,^JAODFèùWM

(1)WSSWSftZBODW^BPBT;

(2)?MTO^W^W￡JZB?￡>=120°,WOY?èWJZDOF=

60°,^JB?^ü=?^?9^J?^TOWTAODFè<)W.

ft￥:(1)M,OF^O;

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L￡i￥]Wtim-5?

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23-(5^-)>JT>?A,B,CH￥/hEgKiWWeg?￡,

D,aw&w,?WMffl+fttHior^Dwf?g(M

A

B

[WJBC,AC?J^<￥^5C￥^D,DBfWJ??jL

[W^JW-:￡n?,

no?.

24.(5^)Ml,AD&/SABCW41^.

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AD=ED,

<()

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AC=BE

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:.AB+AC>AD+DE.

g|JAB+AO2AD.

A

S2￡

[5HFf]è“SAS”nJiiEAADC=AEDE,nJWAC=BE,"JW.

[JW^JiO:M2,f?&AD$l&E,f?.DE=AD,BE.

VAD&/SABC

:.BD=CD.

?AADCW/SEDB

AD=ED

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CD=BD

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BPAB+AO2AD.

SAS,AC=BE,

[Ai￥l

25.(6^)M,SAASC^,D^BCa*!^,DE±AB,DF1AC,iê?OJ^E,F,

BE=CF.sRiiE:AD^AABC?<J?￥^-^.

A

RtAFDE^RtADCF(WL)AD

(W^lüE^:’.'DELAB,DFLAC,

LRtAfiDE^nRtACDF

fBD=DC;

1BE=CF’

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:.DE=DF,

'.'DELAB,DFLAC,AD=AD,

.?.RtAADE^RtAADF(HL),

LZDAE=ZDAF,

LADMAABC?ù?W^.

[￡i￥lè￡

DE=DFMfà^?aü^.

26.(7^-)?EHü^?BCD4bZA+ZC=180°,BDZABC.

(1)$nS1,^ZA=90°.

?HJADCDaWS:^^:AD=CD;

AB=CB;

(2)&1S2,^ZA>90°,WAD^CD^JM^,#iO.

[(1)?èZA+ZC=180°,ZA=90°,WZA=ZC=90°,èBD￥#ZABC,

ZABD=ZCB￡>,iOJAABD^ACBD,WAD

=CD-,

?ti]ZABD^ZCBD,?fAB=CB,ZADB=ZCDB,AB=CB,&üSW,fè.ZADB

=ZCDB-,

(2)DFZBA?BAtfj&%&rf-&F,DEZBC^&E,WJZF=ZCED=90°,éZ

BAD+ZDAF=\80°,ZBAD+ZC=\W°,'^ZDAF=ZC,DF

=DE,^ai^/\ADF^/\CDE,'faAD=CD.

M;(1)?AD=CD,

Sè:ftlSl,VZA+ZC=180°,ZA=90°,

:.ZC=90°,

:.ZA=ZC,

VBDZABC,

ZABD=ZCBD,

&&ABD$1/\CBD4>,

'ZA=ZC

<ZABD=ZCBD-

BD=BD

:./\ABD^/\CBD(AAS),

:.AD=CD,

AD=CD.

?AB=CB,

Sè:è@WAABD^ACBD,

:.AB=CB,

AB=CB.

(2)AD=CD,

ffiHJl:M2,DFZBAi?iBA^&^^^F,DEZBCTtiE,

:.ZF=ZCED=90

VZBAD+ZDAF=]80°,ZBAD+ZC=\SO°

ZDAF=ZC,

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&AADF$1/\CDE^,

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■?±:(1)

nJlU^:ZADB=ZCDB,

?Sé;?Ugll,VZA+ZC=180°,ZA=90°

.?.ZC=90°,

ZA=ZC,

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ZABD=ZCBD,

^./XABDfilACW'l',

'ZA=ZC

-ZABD=ZCBD-

BD=BD

:./\ABD^/\CBD(AAS),

ZADB=ZCDB,

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H?ltt^JféWJt^niR.jEmitfJ^tHMBA^^gljAABDWACBD,#_MEWAABD

^ACBD^W^W^.

27.(7fr)M,AABC41,,^D18Ca±-A.W^sAD,￡BAD

E,CEADaF.

(1)

(2)%ZBAF=\O°,MZ￡FAfiW^60°;

(3)ffl^^^^AF,CF,￡FZ|0]?WS^M,WW.

à

[WJ(I)OSMR;

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iWHZ￡FAf?fi?

(3)AF=EF+CF-,&]ZGAE=ZFCB,iS?????JWZCFA=60°,?

'^AFk\^FG=EF,'-&^GE,^WAFFGMiiEWACFF^AAG￡,

BPWWAF=EF+CF.

(1)WTK^ZF,

(2)VAABC^?àH?^,

:.AB=AC,ZBAC=ZABC^ZACB=6Q

\'ZBAF=?O°,ZABC=60°,

:.ZADB=\80°-(ZBAF+ZABC)=180°-(10°+60°)=110°,

vBAD￡.

:.AB=AE=AC,ZBAF=ZEAF=\0°,

ZZEAC=ZBAC-(ZBAF+ZEAF)=60°-(10°+10°)=40°,

'.'AE=AC,

:.ZACE=1-(180°-ZEAC?=-1(180°-40°)=70°,

22

VZACE=ZACB+ZDCF,ZACB=60°,

:.ZDCF=ZACE-ZABC=70°-60°=10°,

ZZADB=ZCDF=H0°,

:.ZEFA=}80°-(.ZCDF+ZDCF)=180°-(110°+10°)=60°,

60°;

(3)AF=CF+EF,

?éfe?AF±ftFG=EF,J&&GE,

VA