2021-2022学年广东省惠州市仲恺高新区八年级（下）期末数学试卷（附答案详解）

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2021-2022
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-2,0,ᑣᐵ6xḄ789kx+b0Ḅ:;.\-2\0x=2⚓ᐳ17⚓

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56⚓ᐳ17⚓

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8জ:<=ḄOP].ঝ:<=ḄOP].ঞO:<=ḄOQP<ᑖ.8.ூ(ᫀ௃Dூ'᪆௃':ᵫab<%2eyi>g2Uyhxiᜧklmᵫn=kx+4Uopq(0,4),ᦑ⌱:D.ᵫ/g2Uotuvwxyᵫz=kx+4Uo{y|B}|P~.⚪ὃ"JᦪḄឋ&'⚪ᐵ*45Jᦪ{ᦪḄᐵ.9.ூ(ᫀ௃Dூ'᪆௃':ᙠAABC4ACB=90°,ᵫᳮU:AC2+BC2=AB2,,.225+400=S,••S—625.ᦑ⌱:D.ᵫᳮU:AC2+BC2=AB2,oᐭᓽ.⚪X⌕ὃ"#ᳮ2ᳮ'⚪Ḅᐵ*Ạ⚪.10.ூ(ᫀ௃Bூ'᪆௃':OP,᝞ᡠ:•••48CDAC=8,BD=6,11AC1BD,BO=-BD=3,OC=-AC=4,22•BC=5,vPELAC,PFJ.BD,AC1.BD,•OEP•FE=OP,•OPIBCeOPᨵᨬm,WeSAOBC=10BXOC=^BCXOP,OP=2.4,•••EFḄᨬm2.4,ᦑ⌱:B.ᵫḄឋ&U4c_LBD,BO=^BD=3,OC=^AC=4,ᵫᳮBCḄ஺EPUEF=OP,OP1BCeOPᨵᨬmᵫ☢'.

9⚪ὃ"#Ḅឋ&Ḅᑨឋ&ᳮ45Ḅឋ&⚪Ḅᐵ*.11.ூ(ᫀ௃k<0ூ'᪆b':•••B¡ᦪy=kxḄᙠY¥ஹ▲:.k<0.ᦑ(ᫀ:k<0.oᑭᵨB¡ᦪḄឋ&ᑖ᪆U,(ᫀ.W⚪X⌕ὃ"#JᦪḄឋ&BC©5JᦪḄឋ&'⚪ᐵ*.12•ூ(ᫀ௃<ூ'᪆௃':•.•(2¬=12,(3L/=18,k12<18,:.2A/3<3V2.ᦑ(ᫀ:<.ᐜ©²³´ᦪ<µᯠ·᪷´ᦪḄᜧm¸µᓽ'.W⚪X⌕ὃ"#´ᦪḄᜧmḄ¸¸²³´ᦪḄᜧm¹ºᵨ+»ஹ¼½¾ஹ¸஻µḄµ].13.ூ(ᫀ௃Àூ'᪆௃':TS2=0.13,s5=0.02,•1•S0,ᡠ¹D]Ükx+b>0Ḅ'Ýx<-2.ᦑ(ᫀ:x<—2.@ᔠᦪᑏ,oᙠx|àµᡠOáḄâãÌḄåᓽ.⚪ὃ"#Jᦪ{JᐗJD]Ü:tᦪḄÒçஹèéêJᦪy=kx+bḄᜧ(ᡈm)0ḄâãÌxḄ¼åH15.ூ(ᫀ௃6Y10⚓ᐳ17⚓

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•••D,EᑖA3,ACḄBC=7,17•DE=-BC=-,22vAF1BF,:.Z.AFB=90°,•.•஺ABḄAB=4,•••DF=-AB=2,23EF=DE-DF=--2ᦑᫀ|.᪷ᳮDE,᪷!"#Ḅ$%!"Ḅ&'(஺)ᓽ(+ᫀ.,⚪ὃ/ᳮஹḄឋ234Ḅ56%7"89$%7"Ḅ&':
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+BD=6,CPᑮ஺IJK>2ᑮ[N,+4O=4P=y=8=10,ᙠ^_AB^BD=6,AD=10,BELAD,
+4E=5,ᙠRMABEAB=6,AE=5,BE2+AE2=AB2,
+BE=VT1,:0ABCDḄ☢f=ADXBE=10x711=lOVll,ᦑᫀIOVTT.>1i>2ḄJKAJO,8JM,஺JN,᪷PjkḄlmx,OAPḄny,op
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BE=Vn,஺ABC஺Ḅ☢f=4஺X8E,(+yz.,⚪ὃ/kḄ{k|}~ᦪ>Ḅᐵᙠ%ᐵ2ḄNḄuᙶ᪗⊤ḄAD=AP=y(NḄuᙶ᪗).18.ூᫀ௃
=3V3-(3+1-2V3)+4=3V3-4+2V3+4=5.ூ
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13IJxABxh=4,ᓽgx2Kx%=4,E(h=9,(9:AB<Ḅ=>M.ூ᪆௃(1)᪷PQRḄ☢TUVஹWX᪷VḄYᑣஹ
[UVᓽ7(2)᪷PABCᳮ\]AB,^᪷PQRḄ☢TUVEᑮᫀ.⚪ὃḄABCᳮஹWX᪷VḄY᝞abRQRḄcᩩbR:dᑖf“,b,9:d>c,hi஺2+ᢄ=஺2.23.ூᫀ௃(1)lm(••஺ஹEᑖf:ACஹABḄoDEZMBCḄp•••DE//BC,,.DE//CF,•••DF//CE,q:OECFrq:7(2)(ᙠᵫABCᳮE(BC=yjAB2-AC2=V132-52=12,vDEAABCḄp•••DE=-BC=-xl2=6,22••q:஺ECFrq::.DE=CF=6,DF=CE,஺:4CḄo:CD=-AC=-x5=-,222t4஺8=90°,C77Ḅudp.-.ZDCF=90°,ᙠRCADCFᵫABCᳮE(DF=y/CD2+CF2=J(|)2+62=y,Wq:DECFḄᕜd=2(DE+DF)=2X(6+w)=25.ூ᪆௃পlOEyABCḄp:DE//BC,ᵫrq:ḄᑨCᓽE]{|7(2)ᐜᵫABCᳮEBC=12,^ᵫQRpCᳮEDE=gBC=6,ᯠᵫrq:ḄឋEOE=CF=6,DF=CE,^ᵫABCᳮE஺=wᓽE]ᫀ.⚪ὃrq:ḄᑨCឋஹQRpCᳮஹABCᳮ7rq:ḄᑨCឋQRpCᳮ⚪Ḅᐵ.24.ூᫀ௃((1)o4(3,0)ᐭy=gx+b,Eb=4,A8(0,4),•OB=4,14⚓ᐳ17⚓

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