浙江省绍兴市上虞区2021-2022学年七年级下学期期末教学质量调测数学试题(含答案)

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14J.BF//CD,3.ZBCD+ZCBF=\SOa,'3ABLAE,3.ZABF=9Q°,/ABC+/BCD=NABF+NCBF+NBCD=90°+180°=270°.ᦑᫀ+270.ூ,௃-⚪/⌕ὃ23456Ḅឋ9(:;!<=>6(?@ABC645(DEᑁGH⊡JK⚪ḄᐵM.16.3ᑖOPQᑈSᵨᩭVWXYZS[yḄ\]+ᐸ_“+ᡂbZS[(xx+12+XYḄcdexW13,᝞fghXYḄZS[ាjᡂbZS[Ḅk(lmnḄcd36oூᑖ᪆௃ᵫ⚪qghXYḄZS[ាjᡂbZS[Ḅk(ᑡ

15'1'2ூᑖ᪆௃¦¡sḄ+xw(஻(89ymm,©ª'(᪷¬ᔜ®Ḅᐵ¯(ᓽu<ᐵx,yḄ±ᐗg³st´(®ᓽu<.ூ௃¦¡sḄ+X"”“(89ymm,3x=5y¶⚪q:x+2=2yx=10:y=6.•♦¡sḄ¢£+10mm¢6mm.ᦑᫀ+10mm¢6mm.ூ,௃-⚪ὃ23±ᐗg³st´Ḅzᵨ(¹º»[ᐵ¯(:;ᑡ<±ᐗg³st´⚪ḄᐵM.18.e3ᑖO᝞'(½¾E,GᙠC6CDÁ(ÂÃC6EFḄÅÆ.(1)ÉNEFG=120°,ᑣNFGCḄËᦪ30°Í(2);4EH=NFGH=20°,ZH=5O°,ᑣNEFGḄËᦪ140°ூᑖ᪆௃e1O=$F>FM஻4B,᪷¬456Ḅឋ9Îᓽu;e2O"!ὡ0஻48,=$ஹH>HN஻4B,᪷¬456Ḅឋ9Îᓽu.ூ௃e1OF!0"3FE±AB,FM//AB,J.FELFM,

163.ZEFM=90°,VZEFG=\20°,ZMFG=ZEFG-Z£FM=30°,YFM஻AB,AB//CD,:FM஻CD,3.ZFGC=ZMFG=30°,ᦑᫀ+30°Í(2)=$ஹF>FM஻4B,=$ஹH>HN஻AB,C-----------——D:,NAEH=/EHN=20°,*3/EHG=50°,ZNHG=ZEHG-ZEHN=30°,■:HN஻AB,AB//CD,3.HN//CD,3.ZCGH=ZNHG=30°,VZFGH=20°,:/FGC=/CGH+/FGN=50°,᪷¬(1)¾(Z£FA/=90°,ZFGC=/MFG,3.ZMFG=50Q,AZEFG=ZEFM+ZMFG=140°,ᦑᫀ+140஺.ூ,௃y⚪ὃ23456Ḅឋ9(@A456Ḅឋ9Òᳮ⚪ḄᐵM.Óஹ⚪(-ᜧ⚪ᨵ6}⚪(ᐳ46ᑖ.◤ᑏ<Ø⌕ḄᦻÚ~ஹÛWÜÝᡈß~t)19.(8ᑖ)ᑖà](1)a2-6"+9áÍ(2)C-16b.

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.24.+8ᑖ,yz(1)᝞~1,NZBE=160°,NCDE=120°,(N8E஺Ḅᦪ;+2,᝞~2,BFᑖNABE,DFᑖNCDE,ᑣN8EDᨵ᪵Ḅᦪ9ᐵ
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21ZEBF+ZBED+ZBFE=180°,3.ZBED=1SO0-20°-120°=40஺.(2)NBED=2NBFD.ᳮᵫZ8®஺cN,FDE#$ஹM.)BFᑖN4BE,DFG4CDE,3.NABF=Z/ABE,NCDF=L/CDE.22,:AB஻CD,3.ZCDF=NANF,NAME=ZCDE.NE=1800-NBME-NEBM=180°-ZCDE-(1800-NABE)=AABE-ZCDE,¯NF=ZABF-NANF=AABF-ACDF=LNABE-NCDE22=>1(Z.ABE-/CDE),23.ZE^2ZF.ᓽNBED=2NBFD.(3)NBED+2NBFD=36Q°ᳮᵫ°cF±Fᵨ஻Z8,°cE±EN஻CD.ᔆᑖ/N8E,DFᑖ4CDE3.ZABF=NFBM=L/4BE,ZCDf=NFDE=LNCDE.22•3FM஻AB,EN//CD,AB//CD,3.AB//FM//EN//CD,3.NBFM=AABE,ZMFD=ZCDF,:.NBFD=L(NABE+NCDE)2■:NBFD+NFBE+NFDE+NBED=360°,

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23