2021-2022学年江西省临川中考联考数学试题含解析及点睛

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17AADᑖNBAC,.,.ZOAD=ZCAD,VOA=OD,.*.ZOAD=ZODA,.,.ZODA=ZCAD,OD஻AC,VDE1AC,.*.OD±EF,TODO,EF஺OḄᑗ.(2)VOD±DF,ZODF=90°,VZF=30°,/.OF=2OD,ᓽOB+3=2OD,OB=OD,.♦.OD=3,VZAOD=90o+ZF=90°+30o=120°,...஺Ḅফðñ2".1oUூ௃⚪ὃᑗḄᑨឋᙊḄᑗᚖ"#$ᑗḄ%&.'ᵨᑗḄឋᩭ*+,-ᡈ/01234567ᙊ8ᑗ1ᑭᵨᚖ"᪀⌼"<=<>?@ᨵᐵC⚪.DὃEFG.23ஹ(1)4MEFIῪ=<>(2)K?᪆(3)0MK?᪆(4)NOூ?᪆௃(1)ᵫAD஻BC,QRNMFE=NCEF,ᵫᢚTQR1NMEF=NCEF,UVNMFE=NMEF,ᓽQRᑮME=MF,*RXAMEFIῪ=<>Y(2)4ACḄᚖ"ᑖ1ᓽQRᑮᢚZEF,UV[\]Ḅឋ1ᓽQRᑮDḄ^_Y(3)UVBEQgZ\DFP,QRPF=QE,UVNCPgZiNAP,QRAN=CN,UVRtAMC'N`RtAMAN,QRNAMN=NC'MN,*RᑮMEFIῪ=<>1UV=ᔠb1ᓽQRᑮMO_LEFcMOᑖEF(4)UVDᡠ$Ḅe&f஺gᙊ814g%&1ᙊ8ḄE1ᓽQRᑮDᡠ$Ḅe&Ḅ.ூi?௃

18(1)AMEFNῪ(u.ᳮᵫ•••õöuABCDN÷u,.♦.AD஻BC,.*.ZMFE=ZCEF,ᵫᢚøNMEF=NCEF,çZMFE=ZMEF,/.ME=MF,.,.
MEFNῪ(u.(2)ᢚùEF³ᢚø;Ḅtu᝞tᡠ:(3)᝞t,ᵫᢚøDF=DF,.,.BE=D'F,ᙠÒNC'Q³£NAPjNCNQ=N,ANP,NNC'Q=NNAP=9()஺,.,.ZC'QN=ZAPN,VZC'QN=ZBQE,ZAPN=ZD'PF,.,.ZBQE=ZD'PF,ᙠ^BEQ³AD'FPjNBQE=NDPF{BE=D'F,AP=C'Q.,.
BEQ^AD'FP(AAS),.PF=QE,

19•.•õöuABCDN÷u,.AD=BC,.*.AD-FD=BCBE,.*.AF=CE,ᵫᢚøC'E=EC,.,.AF=C'E,AP=CQ,ᙠ4NCQ³ANAPjZC'NQ=ZANP{NNC'Q=NNAP,AP=C'Q.,.
NC'P^ANAP(AAS),.,.AN=C'N,ᙠRtAMC'N³RtAMANjMN=MN'AN=CN'/.RtAMC'N^RtAMAN(HL),.,.ZAMN=ZC'MN,ᵫᢚøZC'EF=ZCEF,•.•õöuABCDN÷u.AD஻BC,.".ZAFE=ZFEC,ZC'EF=ZAFE,.,.ME=MF,/.
MEFNῪ(uAMOIEFüMOᑖEF(4)ᙠEᵫBHýᑮCḄîÝjDᡠåîḄ{|NmOᙊk4ÿ
ᙊ240஺ḄᡧḄ,᝞

20ᦑᫀ■.ூ௃⚪ᔠ⚪
"⌕ὃ%&ᢚ()⚪*+Ḅᑨ-*ឋ/ஹ12345
6Ὺ8Ḅᑨ-*ឋ/9:ᐰ68Ḅᑨ-*ឋ/Ḅᔠ<ᵨ
>?@A6Ὺ8Ḅᑨ--ᳮCឋ/-ᳮDE⚪ḄᐵG.24ஹ(1)50,108°,⊡ID᪆K(2)9.6(3)3ூD᪆௃(1)᪷MANḄOᦪ9:Qᑖ⊤TU23ᓽWXᑮZ[ᕜNᐳ^_`aᦪKᐜcXANᡠe<ḄᙊḄfᦪ
g᪷MᡧᙊḄfᦪ=iᑖᓰklḄQᑖmx360஺TU23ᓽWK᪷MBN^_`aᦪ⊡ᐰᩩo2K(2)᪷MEN^_`aᦪᡠᓰḄQᑖm
ᓽWp22018q“s•u”⁚⌱yzEN{`ḄOᦪK(3)᪷Mᵬஹ}~{UᙠAஹBஹD8Nᔜ⌱yuN
᪛
᪷Mᭆ᳛45TU23
ᓽWXᑮ⌱yzuNḄᭆ᳛.ூD௃D(1)Z[ᕜNᐳ^_`aᦪ15+30%=50(O)
ANᡠe<ḄᙊḄfᦪ30%x360°=108°,BN^_`aᦪ50x24%=12(O)
⊡ᐰᩩo2᝞

21jᦪlj(2)TEmnopᦪᡠᓰḄrᑖsg^xl00%=12%,.♦.2018t“vb”⁚⌱z{Em|oḄjᦪ}g80xl2%=9.6(lj);(3)᪛QRABDABDABDABD•••ᐳᨵ9QXḄ1XḄQឋI1ᐸ⌱z{bmḄᨵ3,31...⌱z{bmḄᭆ᳛==93ூ௃⚪ὃᑡ⊤᪛Yᵨ᪵,Yᡧ>,Yᩩ>,.