2021-2022学年陕西省宝鸡市渭滨区八年级下学期期末考试数学试题

《2021-2022学年陕西省宝鸡市渭滨区八年级下学期期末考试数学试题》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

ᦪ⚪202206Iᑖ⌱⚪ᐳ24ᑖஹ⌱⚪ᐳ8⚪⚪3ᑖ24ᑖ.⚪ᨵ⌱⚗ᔠ⚪Ḅ1.ᑡ!"#$#%&'!"()&'!"Ḅ2.a>b,ᑡ+,-+.ᡂ0Ḅ()A.a-5>b-5B.-5a<-5bC.A>_LD.a+c>b+ccc3.ᑡᔜ-ᵫ5ᑮ7Ḅ8"#9:ᑖ;<-Ḅ()A.a(=+஻)—am+anB.a2-b2-c1—(a-b)(a+b)-c2C.10x2-5x=5x(2x-1)D.16+6x=(x+4)(x-4)+6x4.᝞!AD,CEᑖAaABCḄ#BCDEᑖB.FAB=AC,ZCAD=20°,ᑣNACEḄHᦪ()A.20°B.35°C.40°D.70°5.᝞!ᙠJK"#/Z=90°,/஺=3,BC=5,&DB8஺Eᑖ//8C,ᑣ4BCDḄ☢QR()A.8B.7.5C.15D.STU.6.᝞!Vᦪyi=-2xW᜛2="+3Ḅ!YZ[:\”(m,2),ᑣᐵ:xḄ+,--2x>ax+3Ḅ;_()A.x>2B.x<2C.x>-\D.x<-17.᝞!ᙠJK"#&DBNCC8஺Z[:\O,ᑡᩩa+bᑨdJK"N8CQEeJK"Ḅ

1A.AB//DC,AD//BCB.AB=DC,AD=BCC.AB//DC,AD=BCD.OA^OC,OB=OD8.᝞!ᙠk/BC#N4=90°,஺48Ḅ#\q\஺r8cḄEeB[ZC:\E,r8cḄᚖB[BC:\wAB=CE,xkOFEḄ☢QR1,ᑣ8cḄ|RA.275B.5C.4A/5D.10ᑖ⌱⚪ᐳ96ᑖஹ⚪ᐳ5⚪⚪3ᑖ15ᑖ9.K"ḄᑁDC᜜DCḄ3ᑣK"ḄKᦪFᐵ:xḄᑖ-2=£Ḅ;ᦪᑣkḄ10.11.ᑖ;<-2-8஻=.12.Fxy,ᑣxm?ym2"ஹஹ2ஹW"13.᝞!ᙠ4ABC#,AB=AC,BC=4,Z\ABCḄ☢QR12,ABḄᚖEᑖBEF[AC:\F,FDRBCKḄ#\,MRB¡EF¢Ḅ£\ᑣkBDMᕜ|ḄᨬR.ஹ;¦⚪ᐳ13⚪81ᑖ;¦§ᑏ©qߟ1জ14.5ᑖ;+,-ª2…¬4%-13%-2ঝ15.5ᑖᐜᓄ¯E—a-1+²³´a=l¶·ᦪ-.16.5ᑖ¸ᙢᨵºᡠᜧCºᩩZ[Ḅ½¾᝞!ᡠ¿\M,N⊤¿ᜧ,OA,OB⊤¿½¾.

2ÁᑜᙠNAOBḄᑁÃÄÅᱥÇÈÉxÈÉᑮºᡠᜧḄÊËZ,ᑮºᩩ½¾ḄÊËÌZ,.ÍÎᵨÐÑr!TU.ÈÉᡠᙠḄÒÓ.Ôᶇr!Ö×+ᑏrTX317-5ᑖ;T-JQ18.5ᑖ᝞!ᙠE☢Dᙶ᪗Ú#ÛÜkABC⚔\Ḅᙶ᪗ᑖARA-1,-1,B-3,3,C-4,1.ᙠ!#Þ©k/8Cß\/ᢥá¶┐ãä90°åḄk4&Gèᑏ©\CḄ&§\C2Ḅᙶ᪗.19.6ᑖ᝞!JK"#AB=DC,é&DBêCᔣºìᑖAí|î\E,F,ïðñBE,DF,F8E=OEòóJK"ê8஺EeJK".20.6ᑖ¸½ô◤éᢇᩞᧇùúûᔆᑜýᵨᵬஹÿ
ḄᙠḄᵨ30ᵬ501500ᩞᧇᵨ20ᵬ601400ᩞᧇ.%1&ᵬஹ
Ḅᑖ)*+ᩞᧇ,%2&-./0123⌕567ᔆḄ9ᢇᩞᧇ;<=1245.>ᑜᵨᵬஹ
Ḅᐳ70BḄᦪD;<=ᵬᦪDḄ3EF23GHឋJ9ᢇᩞᧇ567ᔆᐳᨵLM
Nᫀ,21.%6ᑖ&᝞RᙠSABCWCA=CB,ZACB=4ZA,X஺Z/C\ḄWXDEVAC]AB^XE,_`CE.N/%1&aḄbᦪ*d21⚪R,%2&aghBE=2AE.22.%6ᑖ&ᡃjklH_`mnGop\qᔜ\WXsᑮḄp\quvWXp\q.᝞Rᙠp\qN8CDWEஹFஹGஹᑖ)Z\/8ஹBCஹCDஹD4ḄWXlH_`ᔜ\WXsᑮḄWXp\qEFG”.%1&9oWXp\qEFGHḄq~Z
if2gḄ.7Bd22⚪R

323.(7ᑖ)▅ᑡ⚪Ḅ⚪=h°ஹbஹcS/8CḄ\B2-ᓈ2=/-ᑨS/BCḄq~.:-Z>2c2=a4-b4(A)Ac2(a2-b2)=(a2+b2)(a2-b2)(B).c2^a2+b2(C)...S/8CZ£¤¤q¥h(1)¦§⚪=¨LG/©ª«¬┯®,ᑏ«F/Ḅ°h(2)┯®Ḅ±²:24.(8ᑖ)᝞R³´p\qḄµ¤¶/C,8஺·]^X0,/C_L/8,XEZCDḄWX/8=6,OE=5.(1)a8CḄº;(2)a³´p\qN8CDḄ☢½.25.(8ᑖ)᝞R0Z¾\S/BCᑁGX_`04ஹOBஹOC,BOA=3,08=4,0C=5,JS8/0ÀX8ÁÂ┐ÄÅÆsᑮSBCD,_`OD.(1)a¶ÇḄºh(2)aN&X?Ḅbᦪ.26.(9ᑖ)᝞RSZB஺Z\º6Ḅ¾\¤qÌZZC\¦GÍXᵫ4ᔣC5Í(Ð4ஹC;Ñᔠ)஺ZC8Óº¶¦GXÐXPÕÂÖ·ÕḄ×bᵫ8ᔣC8Óº¶Nᔣ5Í(஺;Ð8Ñᔠ)=ÌØ^E,_`Ì஺]^஺.(1)Ù/8஺஺=30°ÂaZPḄº/(2)5Í=W¶ÇEOḄºZᔲÜÝÞᓄ,᝞à;Þa«¶áÇâ)Ḅº᝞àÞᓄãᳮᵫ.\B

4æçèᦪéêὃìᫀ(202206)Gஹ⌱î⚪(ï⚪3ᑖᐳ24ᑖ)⚪12345678ᔁñᫀACCBBDCAòஹóô⚪(ï⚪3ᑖᐳ15ᑖ)9.æ10.k>411.2a(a+2)(a-2)12.213.8ஹì⚪(ᐳ13ï⚪ᐳ81ᑖ)14.h;¾öজø1,sh(2ᑖ);¾öঝ4(x-I)>3.2,shx>2(4ᑖ)ᑣ;¾öýḄþx>2.(5ᑖ)15.h±öòÿ-Ca+1)]4--a+12ᑖ)=a2-l-(a+l)(a-3).(a-3)2a-3(a-3)-3a+1a=(a+1)(a-l-a+3).(a-3)2=2(a+l).(a-3)2=2(«-3)=2a-6,(4ᑖ)a-3a+1a~3a+1a=l=2-6=-4.(5ᑖ)16.,4I—*/v——(᝞Pᓽ!ᡠ#$%(&4ᑖ'(1ᑖᐳ5ᑖ)17.x(x+1)-(x+1)(x-1)=3(x-1),(2ᑖ)N+X-X2+1=3X-3,-2X=-4,X=2.(4ᑖ),-.x=2/ᑖ01Ḅ.(5ᑖ)18.᝞A48Gᓽ!ᡠ#&567.(3ᑖ)2GḄᙶ᪗!(1,2)(5ᑖ)19.;<ᙠ>8E4@>஺BCD1AB=DC•AE=CFBE=DF:*,BEAmADFC(SSS),(3ᑖ)NEAB=ZFCD,.NB4C=ZDCA,.AB//DC.J4ᑖK0AB=DC,

5LM7NBCD/NOLM7.J6ᑖK20.J1PᵬRSTUVWXYxZᩞᧇ]RSTUVWXYyZᩞᧇ^⚪`a30x+50y=1500,ax=25.l20x+60y=1400ly=15bᵬRSTUVWXY25Zᩞᧇ]RSTUVWXY15Zᩞᧇ.J3ᑖK2Pcᵨ஻VᵬRSTᑣcᵨJ70-gKV]RST^⚪`a125m+1570-m41245,ahWmWk.170-m43m22l•••m!᦮ᦪp"?Wst18,19,...uvwᐳᨵ2ycT0ᫀ0ᫀ1cᵨ18VᵬRST52V]RST{0ᫀ2cᵨ19VᵬRST51V]RST.J6ᑖK21.1P]4Ḅ|ᦪ!x,ᑣN4CB=4/4=4x,'.'AC^BC,.•./8=4=x,ᙠ>/BCDN/+/8+N4C8=180°,.♦.x+x+4x=180°,ax=30°,AZA=30°,bN/Ḅ|ᦪ/30°3ᑖK2;<{£K/4cMḄD,DEA.AC,0.AE=CE,.ZECA=ZA=30°lN/CB=4NN=120°,.NBCE=90°,l•.•N3=30°,BE=2CE,.BE=2AE.6ᑖK22.1NOLM7.J1ᑖK2;<4C,/48ḄDB/BCḄD/஻4C,EF=Lc,2ᳮ"G஻C,HG=1AC,WaEF//HG,EF=HG,ᦑLM7EFGH/NOLM27.J6ᑖK23.1┯Ḅ!C3ᑖK2┯Ḅ!ᨵὃ⇋஺=6ḄJᡈ>ABC/Ὺ567K.J7ᑖK24.1•.•LM748஺/NOLM7.•.80=஺0,•.,E/CDḄD.♦.OE/>OCZKḄD{.5C=2OE=10{4ᑖK

6J2'JACLAB,.ZBAC^90°,.AC^]BC2-AB2=V102-62=8-...NOLM7Ḅ☢=6x8=48.
8ᑖK25.:
1•>5/08┐¡¢aᑮ>8C஺>480¤/XCBD,J1ᑖK.../O=CD,80=8Z,NAB0=NCBD,dBC/M567NABC=60°,ZOBD=OBC+4CBD=NOBC+NABO=NABC=60°,/.AOBD/M567,00=08=4.
4ᑖK
2vOD=OB=4,CD=AO=3,0C=5,.0D2+CD2=\6+9=25,OC2=25,OD~+CD2=0C2,>ODC/¥6567ZODC=90°,••AOB஺/M567ZODB=60°,•1.ZBDC=^BDO+ZODC=150°.
8ᑖK26.
1;>NBC/M¦!6ḄM567.../NC8=60°,'ZBQD=30a,:.NQPC=90°,P/B=x,§iJPC=6-x,QB=x,.,.QC=QB+BC=6+x,:ᙠRtAQCPD/BQD=30°,J.PC^^QC,ᓽ6-
6+x,ax=2,.•.NP=2
4ᑖK(2)¨©Pஹ஺«¬®|¯k஺EḄ¦|°±ᦋ³.ᳮᵫ᝞µ:¶P&BB஻QC,...>/FP/M567,:PஹQ·¸ஹ®|¯ᓽ8஺=©B,.BQ=PF,:.DBQmADFP(.AAS),.BD=DF,¹>/BB/M567PELAF,'AE=EF,DE+(BD+AE)=AB=6,.DE+CDF+EF)=6,ᓽ஺E+OE=6{.Z)E=3!º»ᓽḄ¦°³.(9ᑖ)¨pBஹ஺«¬®|¯k஺EḄ¦|°±ᦋ³.ᳮᵫ᝞µ:&0B¼¥Z8½B஺E,PF,PEL4BE,.ZDFQ=ZAEP=90a,•••¾ஹ஺®|¯...NPuB஺,.•>/8C/M567:.NA=NABC=NFBQ=60

7ᙠ>/¿£■@BDVZAEP=ZBFQ=90°,:.NAPE=NBQF,fZAEP=ZBFQZA=ZFBQ1IAP=BQ.'.,APE2ABQF(44S),0.AE=BF,PE=QFS.PE//QF,.•.LM7PE஺B/NOLM7.•.஺£=ḂÁ'2■;EB+AE=BE+BF=AB=EF,.DE=1^B,23•56/XABCḄM¦!6,:.DE=3,...Pஹ஺«¬®|¯kDEḄ¦|°±ᦋ³.