【中考真题】2022年辽宁省丹东市中考数学试卷（附答案）

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2022
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18.\AJ=EJ,DE3VsinZECD=—=1CE=5,CE5:DE=3,CD=4,.AJ=EJ=CD=4CJ=DE=3,fᙠñZkA/O«ᓲ=(r-3)2+42,.25..r=#f6•••஺஺Ḅ×Ø1.6ூAB௃C⚪ὃF'îNON¡ᑗÔḄᑨæᚖØæᳮá¡Ḅᑨæuឋõäåæᳮµ¶'⚪ḄᐵUSᮣ÷ᵨᡠmµ¶'øù⚪úÞ«ὃûὃ⚪.22.ü´Aþÿ
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19ZGAD=ZADC=53°,ᙠRdABC!ZABF=50°,A8=40•,MF=AB«sin50°=40x0.77=30.8().AE=AF+EF=64()AE64ᙠYAAOE!AD=------a—=80()sin5300.8.•._aAbc
Ḅ80.ூd௃e⚪ὃgh4i%&%jḄkᵨ-lᔣ%n⚪᪷⚪oḄpqᩩstuᔠwjxy〉{Ḅ|}~4⚪Ḅᐵ.23.(l)y=-2x+160(2)├ᓫk)50ᐗ(3){├ᓫ54ᐗᜩᑭᨬᜧᨬᜧᑭ1248ᐗூᑖ᪆௃(1)ᜩḄ├ᦪy(s)a├ᓫx(ᐗ/s)
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20•.•¶)├ᓫᡂe¢£54ᐗ.x=50,5├ᓫk)50ᐗ(3)ᜩᑭ·ᐗw=(%-30)•(-2x+160)=-2r2+220x-4800=-2(x-55)2+1250,V-2<0,»¼½i~x=55,¾54,.x=54w¿ᨬᜧÀ,ᨬᜧÀ-2x(54-55)2+1250=1248(ᐗ)5{├ᓫ54ᐗᜩᑭᨬᜧᨬᜧᑭ1248ᐗ.ூd௃e⚪ὃgÁ¦'ᦪÁᐗ¥¦lÂ¥¦'ᦪḄkᵨ4⚪ḄᐵÃÄ⚪ᑡ,'ᦪᐵÂÁᐗ¥¦l.24.(1)BE=DG,BELDGফBE=2DG,BE1DG,ᳮᵫÇ4᪆9(3)SAMNG=-ூᑖ᪆௃(1)ÈÉABAEÊËD4G,/ÁÎ,uÏ(2)ÈÉBAEs/VMG,/ÁÎ,uÏ(3)4Ð&%jABE,+BE=3,᪷(2);=2DG=6,,&%j3EGḄ☢ÒÈËMN£>ÖËMNG,ËMNGaË5EGḄ☢Ò×Ø14,/+uÙ.(1)4ᵫ⚪ÚÛjABC஺ÂÚÛjAEFGÝlj.AB=ADAE=AGZBAD=ZEAG=90°,ff./BAD-4DAE=NEAG-NDAE,.ZBAE=ZDAGf./\BAE^/\DAG(SAS),:BE=DG,NABE=NADG,.ZADG-^ZADB=NA8E+NAO8=90஺5ᫀ;15⚓ᐳ23⚓

21.ZBDG=90°,:.BE1.DG2(2)BE=LDG,BEIDG,ᳮᵫ᝞à2ᵫ(1)NBAE=NDAG,..ADAGஹ•----=——=2,ABAE./\BAE^ADAGf----==2,/ABE=NAOG,BEAB.NAQG+NAOB=NABE+NAO8=90஺,.\ZBDG=90°,.BELDG,(3)᝞w,AHJ_80”,âan/gã=*2'/.AH=2x,BH=x,ᙠYËA3”!,x2+(2x)2=(ä)2,AH=2,ᙠRtAAEH!,5ᫀ;16⚓ᐳ23⚓

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23(2)ᑭᵨ)ᦪi~5cḄ4᪆y=-^x+3,PḄüᙶ᪗஻z,ᑣP(72b--m2+m+3)E(m,-4m+3),ᓽ஻=,m2+3஻?f4242(3)᝞EஹFᑖH,FG)G,!^BOC^/XPFE,"=#$ᡠ=ᡈ(--w2+-/n),+ᵫPEBC542&CEHs^CBO,—,$CE=⌮m,0ᔠCF=EF,EF=gCE=EHOB221m,3456$7ᓽ8ᫀ4(4):Q(2,f),ᑖ=>?@AজC஺"ាGHᙠJKLMNO஺஺ᡠᙠḄQORSঝC஺'ាGHᙠJKLMNOCQRSঞC஺’ាGHᙠJKLMNODCZ[ORSᑖ$஺Ḅᙶ᪗ᓽ.(1)7A••aᱥOy=ox2+x+c(஺g)hxiA(-2,0),B(6,0)=.J4a-2+c=0••[36a+6+c=O'7A”rc=3•aᱥOḄ⊤tuvy=-N+x+3(2)7A••aᱥOy=-%2+x+3hyiC,.C(0,3),:QOBCḄ7᪆uv>=|+}~3(6,0)ஹC(0,3)ᐭ6k+h=0:h=3k=--7A]2,b=3QO5CḄ7᪆uvy=-f+3,:Ḅᙶ᪗vᑣ(᝞-12++3),EGn,+3),8ᫀ18⚓ᐳ23⚓

24:h=—m2+m+3-(-!+3)=—m2+—m94242••▲ᑁaᱥORḄ/.0

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26£¤LOCPOKL,:.CP=OD=4,0C=3,NOCP=90஺,NPCQ+NOCQ=90஺.ZPCQ=ZCOP9CP4/.tanZPCQ=tanZCOP=—=y,.—=tanZPCQ=~,CG3.3-t_4>.———237A;.Q(2,I)ঝC0"ាGHᙠJKLMNOCDRS᝞¦§CDiG”K,•••஺h஺'ᐵQOCQMCQᚖQ¢ᑖ஺01.ZOCQ=ZDCQ,,.,GH//OC,.ZCQG=ZOCQ,.ZDCQ=ZCQG,.CK=KQ,.CஹPᐵMMᓽG஺ḄGH//OC//PD,••K஺஺Ḅ3.K(2,-),28ᫀ21⚓ᐳ23⚓

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OC=90஺ZOfCK=ZDCOf•••OCKs/^oc஺.OKCKCO.OKCK3..---==----,ᓽHr----=----=-1ODCOCD435129.OK=®CK=§924/.OK=OC+CK=3+-=—,550¯1224°•.O-yM°•••MO஺Ḅ:.M-—
,55:QOCQḄ7᪆uvy^k'x+h',8ᫀ22⚓ᐳ23⚓

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