2019北京某中学初三（上）期中数学含答案

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2019ᓅ
ᦪஹ⌱⚪⚪ᐳ16ᑖ⚪2ᑖ.⚪ᙳᨵ⌱⚗ᔠ⚪"Ḅ⌱⚗$ᨵ.1.2ᑖ%ᑡ'᪗)*+,Ḅ)A.oD.2.2ᑖ.ᱥ0y=x+22-3Ḅ⚔8ᙶ᪗)A.(2,-3)B.(-2,-3)C.(-2,3)D.(2,3)3.2ᑖ@A3x=2%CD%ᑡEFGᡂIḄ))A.A+T=5B.A=Zc.=2D.A.=232y3y24.2ᑖ᝞'ᙠ8஻ஹ᜛ᑖPᙠQRACSDE"BC,T49=6,BD=2,Q£=9,ᑣᵨḄY)()A.8B.6C.4D.35.2ᑖ᝞'\a1^_`⚔8ab┐de90஺hᑮB'Cjk,T/1=25°,ᑣ/ᱥCḄnᦪ)

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2A.জঝB.জঞC.জঞটD.ঝঞটoஹ¼½⚪⚪ᐳ16ᑖ⚪2ᑖ9.2ᑖ¾ᑏÀᔣÁÂyx¥80,-1Ḅ.ᱥ0Ḅ|᪆E.10.2ᑖTopqᦪrḄ's᝞'ᡠuÃijac0¼“ு”ᡈ“=”ᡈ“<”.11.2ᑖ᝞'ᙠÊ46D,£ᑖP)46,஻1SḄ8jkËCDÊ?!ÍḄ☢ÎÏÐ).BC12.2ᑖ8/-1,%ஹB1,Ñᙠopqᦪy=f-2x-1Ḅ'sᑣQÒḄᜧᐵÓ)Qyi.ᵨ“>"ஹ"V"ஹ“="¼½13.2ᑖ᝞')Öᡂ×ØᳮḄu"'᪷Ú'᪗ÛḄÜÝ᝞Þᱥß48Ḅàn~18⚗CDáᙠᨩãᡠᡂḄ×ᑗḄànË~cm.14.2ᑖᓅ
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4

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725.,6ᑖ-MNOPQᑭᵨSTUP᪥WᩚḄYZ᝞\᝛ᙠ_G`aTZ;1bḄ᪗ᩚU8ᐸST;0.8bOGWᩚᢗSḄgᑖᙠᙢhigᑖᙠ_jkᱥḄᜋhU8WᩚjkᱥḄno;10bWᩚᙠᜋhḄSY;2bpqMNOPrsP᪥WᩚḄYZ.26.,6ᑖ-ᙠt☢vwᙶ᪗yz{,-4,-2-,}z4ᔣt6ᓫTZ8ᑮz,1-vᑏsz6Ḅᙶ᪗A,2-ᱥ-f+6x+cz4B,>ᱥḄ⊤@A,3-ᱥ-f+6஺Ḅ⚔zᙠvy=^2hCᱥ46ᨵᨵᐳzG>ᱥ⚔zᙶ᪗tḄ¡£.¤5-432-5

827.,7ᑖ-¦§#ᙠ¨Ὺvwªw«48cyAB=BC,NABC=90°,஻t☢hz®¯}¯°z8⌮G┐³´90°8ᑮ·A®4CD.,1-ᙠ\1y⊡ᐰ\«º»¼#.CD.,2-Cz஻ᙠt☢h½Gp¾UCE,AB,ᑗḄᦪᐵ.,3-᝞\2,z{ᐵvÀḄÁÂz®ÃDF,BF.16=11,Ä=7,"=14,>஻ḄTZ.28.,7ᑖ-DÆ#Át☢vwᙶ᪗ÇÈhḄz஺,a,b%Ãᱥy=3+aᡝ6,ᡃËÂP,a,6-ᱥy=*+ax+6ḄÎÏzᱥy=x2+a*+Z>z/,a,6-ḄÎÏᱥ.᝞\¦§z;4,-2,-2-,6,4,-2-,<7,1,4-.,1-z/ḄÎÏᱥḄÕ᪆@;;4ᓰØzḄᱥḄÎÏzᙶ᪗;.,2-Ùz,a,8-ᙠv஻1h½#জz,a,b%ḄÎÏᱥḄ⚔zÛᙠOᩩᱥQh>ᱥQḄÕ᪆@;ঝCz,a,b%ḄÎÏᱥḄ⚔zßᙠᑁgGpvᑏsaḄ¡£.

9

102019ᓅ
ᦪὃᫀஹ⌱ã⚪,6⚪ᐳ16ᑖM⚪2ᑖ.⚪ᙳᨵæ⌱⚗èᔠ⚪êḄ⌱⚗ᨵ.-1.ூᑖ᪆௃í\«°_z³´180°,᝞³´îḄ\«ïðñᩭḄ\«óᔠôõ2\«ö÷øyùÁÂ\«2z÷øÁÂyù.ூÕú௃Õ#ûüyùÁÂ\«ᦑ<⌱⚗┯ÿB,
ᦑ⌱⚗┯aᦑ⌱⚗஻ஹ
ᦑ⌱⚗┯ᦑ⌱C.ூ௃⚪⌕ὃᐵ"#$.2.ூᑖ᪆௃*+ᑭᵨ⚔/Ḅᱯ23⚔ᙶ᪗.ூ67௃68ᡝ2:J3=ᱥ?Ḅ⚔/.••=ᱥ?Ḅ⚔ᙶ᪗A8-2,-3:.ᦑ⌱B.ூ௃D⚪⌕ὃḄEFGᦪḄឋJKLEFGᦪḄMN/6⚪Ḅᐵ".3.ூᑖ᪆௃᪷PQRḄឋJᓽ2TᑮVW.ூ67௃63x=2y,•x_2•--------,y3ᦑ⌱C.ூ௃D⚪ὃQRḄឋJ\]KLQRḄឋJ6⚪Ḅᐵ".4.ூᑖ᪆௃᪷P⚪_`abc?d஻Q•eḄ?fᡂQRᒹ■=jP2k3T4஺ḄmnᡠkpABACAE.

11ூ67௃6/஻=6,BD=2,:.AB=AD^BD=8!,DEHBC,v=9,.AD=AE,*ABAC*4.AC=12,4.EC=AC-AE=12-9=3ᦑ⌱D.ூ௃⚪⌕ὃbc?ᑖ?fᡂQRᳮḄᳮ6yzᵨ.6⚪{◤⌕᪷P}3T~6Ḅmn.5.ூᑖ᪆௃ᵫḄឋJ2T஻ZACA,=90°,NBAC=/B/C,ᵫ*MḄឋJ2TN/M'C=/CAA'=45°,ᓽ236.ூ67௃6/8C*⚔C{┐90஺Tᑮ/'B'C,4.AC=AC,AACA=90°,ZBAC=NBAC,4.ZAA'C^ZCAA'=45°,Nl=25°,AA'C=20°,AC=20°,ᦑ⌱B.ூ௃D⚪ὃḄឋJ*MḄឋJᮣzᵨḄឋJD⚪Ḅᐵ".6.ூᑖ᪆௃ᵫEFGᦪy=-3/+1ḄxᢚᡠT=ᱥ?Ḅᜧ¡=ᱥ?Ḅᜧ¢£¤¥ᔣ¢§ᯠᑏ$80,1:ᐵxḄḄᙶ᪗ªᑭᵨ⚔/ᓽ2Tᑮ«=ᱥ?Ḅ6᪆/.ூ67௃6EFGᦪy=-3/+1ḄḄ⚔ᙶ᪗A80,1:,80,1:ᐵxḄḄᙶ᪗A80,-1:,¬AEFGᦪ®-3f+1ḄxᢚᡠT=ᱥ?Ḅᜧ¡=ᱥ?Ḅᜧ¢£¤¥ᔣ¢§ᡠkᡠT=ᱥ?Ḅ6᪆/Ay=3/-1.ᦑ⌱D.

12ூ௃D⚪ὃEFGᦪ°±²ᣚᵫ=ᱥ?b´Ḅµ
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Õ/Ḅᐵ¾2kT$7ᫀ.ூ67௃6জᵫ2`=ᱥ?ᔣÃᡠkজঝÙÑ*=-2{yÛᨬᜧÏᑣᵫ~Þᓰᑮx=-2Ḅàá¢ÕâaḄãᙶ᪗äå¢Õæ4Þ6Ḅãᙶ᪗çᯠ
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Õ/Ḅᐵ¾þÿᩖḄᦪᔠ⌱⚪.ஹ⚪⚪ᐳ16ᑖ⚪2ᑖ9.ூᑖ᪆௃ᱥ"#$ᔣ&⚗(ᦪᜧ*0,ᯠ.ᑏ0ᓽ2.ூ34௃35ᱥ"Ḅ3᪆671.

13ᦑ4ᫀ75:14ᫀ;<=.ூ>?௃⚪ὃABᦪḄឋD#EF⚪G4ᫀ;<=ᡠᑏᦪ3᪆6Ḅ⚗(ᦪ=I⌕ᜧ*0.10.ூᑖ᪆௃✌ᐜᵫᱥ"Ḅ#$NᔣᑨPaR0Ḅᐵ(ᵫᱥ"RyUḄV>ᑨPCR0Ḅᐵ(XYᑨPacR0Ḅᐵ(.ூ34௃35[ᱥ"Ḅ#$ᔣ\4.a<0,•.•RyUḄV>7ᙠyUḄ_`U&Ac>0,ac<0.ᦑ4ᫀ7<.ூ>?௃ὃAᦪᡝc(ᦪdeḄfI.⚗(ᦪagIᱥ"Ḅ#$Nᔣhᜧ.iᦪ⚗cgIᱥ"RyUV>.11.ூᑖ᪆௃᪷klmnop"Iᳮr0s஻6GDE=LBC,XYr0v/sS/X/SGx᪷kyzlmnḄ☢|2}~*yz}ḄNr04ᫀ.ூ34௃35஻ᑖ484C&Ḅo>6Ḅop"C.DE//BC,DE=LBC,2t\ADEsXABC,.SAADE_/DEx2_1••-------l---
——,,vABCBC4ᦑ4ᫀ75154.ூ>?௃ὃAlmnḄop"ḄឋDyzlmnḄᑨIhឋDlmnop"ḄឋDyzlmnḄឋD_f34Ḅ.12.ூᑖ᪆௃ᑖ7-1ஹ1Ḅᦪᯠ.}ᦪḄᜧᓽ2.

14ூ34௃35X=-1a=V-2x-l=2[x=lyi=x-2x-1=-2[V2>-2,ᦑ4ᫀ7.ூ>?௃⚪ὃABᦪ¡&>Ḅᙶ᪗ᱯ¥5ᦪ¡&>Ḅᙶ᪗¦§ᐸ3᪆6.©ὃABᦪḄឋD.13,ூᑖ᪆௃_fᳮ3«ᡂḄ®ᳮ:;AB஻CDᡠ>AABEACDO,ᑣᨵ±=®•Y4?Ḅ´µᡠ¶2CD20·0CD.ூ34௃355v¸3v¹஺.AB=45"CD20'@,4AB=18cm,[.38.ᦑ4ᫀ758.ூ>?௃¾⚪¿⌕ὃAByzlmnḄsᵨyz}~*ÁsÂÃ}ᙠyzoᵨr}ÄÅ.14.ூᑖ᪆௃ÆlᜧÇÈ▾ḄÊ7xË᪷kyzÌnḄឋDᑡ0}Î6ᓽ2.ூ34௃35ÆlᜧÇÈ▾ḄÊ7xËᵫ⚪Ïrx540=955,3r*=72Ëᦑ4ᫀ7:72.ூ>?௃⚪ὃAḄyzÌnḄឋDyzÌnḄÁsḄ}y~3⚪ḄᐵÓ.15,ூᑖ᪆௃᪷k⊤·0ᦪÁÕUx᪷k⊤Ö×hᦪḄÁÕឋr0y=lḄxḄᓽ2.ூ34௃35[x=0,x=2ḄᦪØ-3,y~,•••ᦪḄÁÕU7Ù"x=l,

15,4x=-1y=l,/.x=3y=1,᪷k⊤ÚrxÜx=lÝᑮᨬx>lᦪ⌲>àᜧ.••ᱥ"Ḅ#$ᔣ&1>0ᡂáḄxâäxV-1ᡈx>3,ᦑ4ᫀ75x<-1ᡈx>3.ூ>?௃⚪ὃABᦪḄឋD¿⌕ᑭᵨBᦪḄÁÕឋçè⊤Ö×·0ÁÕU3᪆63⚪ḄᐵÓ.¾⚪©2¶fI0ᱥ"Ḅ3᪆6x3;~6ᡈᑭᵨᦪnᩭfI.16.ூᑖ᪆௃᪷kᱥ"ÁÕU3᪆6Æ>êᙶ᪗72,m
,ë/LyU*>ìë஺'0Ù"x=2,ív48îv4஺஺r4ᱏ4g2ஹPgQO'=m,ᑣ>O'ᙶ᪗72+஻m-2
,ð>O'ᙶ᪗ñᐭᱥ"3᪆6rᑮᐵ*óḄNô3Ã2rõḄᓽ2r4ᫀ.ூ34௃35,•ᱥ"-4xÁÕU7Ù"x=-2=2,2Æ>Aᙶ᪗72,m
,᝞ëU*>÷ë஺'0Ù"x=2,:.NAPg/AQO'=90°,4.ZQAO'+ZAO'g90°,,4AQAO'+N%=90°,ZAO'Q=AOAQ,@/0AQ=/A0P,4.ZAO'Q=Z.AOP,ᙠvó^h/0o,

16'/APO=NAQO',•,AO=AO/4./\AOP^/\AO'Q".AAS%,4.AP=AQ=2,PO=QO'=m,ᑣ>O'ᙶ᪗72+ù/-2,ñᐭy=f-4xr5m-2—
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x+12-4,ᑣWJKᦪḄ⚔ᙶ᪗U!-1,-4.ூX௃W⚪ὃZJKᦪḄឋ[\ᦪHIᦪ᪆@]^[\ᦪHIᦪ᪆@_`FGHab⚪Ḅᐵ.18.ூᑖ᪆௃᪷cdḄឋᑮf*gBC2ᑮ▢=ᑗklᑮᱥ᪷//=/**ᑮ/ADB=NBDE,kl5op.ூ௃5/O•••rf4s■u6cdᑮf஻s(XABgXDBE:.BA=BD.

174.ZA=ZADB.'4ZA=ZBDE,4.4ADB=BDE.᝞yᑖN{|.ூX௃"⚪ὃZ}cdḄឋOজ*ᑮcdḄ(ঝ*cdᡠḄᜳcd(ঞcdஹḄᐰ.ὃZ}⊡.19.ூᑖ᪆௃!1)᪷ᨵḄ5/ᓽN.!2)ᵫ!1)ḄNᐵ/£Ḅs@>ᐭᦪ1ᓽNI/£Ḅ.ூ௃!1)5/O•.•¡!2)ᐭIaḄAᓽ(!2)ᑭᵨÓHÔJKᦪÕ(!3)Ö×ᦪᦪÕØ-4ீÚ1ÇᦪḄᨬᜧAU4,NᑮyḄÝAßU-5<á4.ூ௃O!1)ᵫ⊤ËᱥḄ⚔ᙶ᪗U!-1,4),Íy=a!91)=(0,3)>ᐭa(0+1)ஹ4=3,a=-1,

18ËᱥḄ᪆@Uy=-Cx+1):!+4,ᓽQ=-f-2A+3((2)᝞,ூX௃"⚪ὃZ}[\ᦪHIJKᦪḄ᪆@Oᙠᑭᵨ[\ᦪHIJKᦪᐵ\@Ç⌕᪷⚪èéḄᩩë⌱íាØḄGHÍᐵ\@kl>ᐭᦪAI.CïᙢØËᱥÇÈ⌱íCï@ᵨ[\ᦪHᑡᐗCKG7óᩭI(ØËᱥḄ⚔ᡈÌôÇÈÍᐸ᪆@U⚔@ᩭI(ØËᱥxôᨵ÷ÇN⌱íÍᐸ᪆@U÷@ᩭI.ὃZ}JKᦪḄឋ.21,ூᑖ᪆௃(1)ᵫ_ø஺UúᙠyôḄûürf/a'þᜧUøᩭḄÿᑮ/B'C,᪷Ḅឋ'ஹ6’ஹC'Ḅᙶ᪗/B'C(2)ᵫ(1)ᓽ8,஺%Ḅ&'᜛CḄᙶ᪗.ூ+,௃+.(1)/00234ᙠy7Ḅ89:4<1=ᜧ20ᩭḄ%@ᑮB'C,4.A'(4,0),B'(6,4),C(10,-4)᝞CB'C.

19(2)ᵫ(1).B'(6,4),C(10,-4).ூD௃E⚪ὃHICJKᣚ.MNOPᐵR0ḄCJḄKᓄᱯUᐵV.22.ூᑖ᪆௃(1)Yᱥ[\x7ᨵ%_`abcdᑨfg=Z/-4ac>0ᓽ(2)᪷⚪N/(I,0),C(0,k-1),᪷noJ☢qᓽᑮ⊟ḄstᑮYᱥ[Ḅ⊤vgூ+,௃+.(1)᪷⚪Nᨵ.=᝞-4w4=(஻-2)2,•4k>2,ᡠ/Yᱥ[\x7zᨵ%_`.(2)ᵫ(A>2)|&}7x=K>l,2x=0y=lx=0,y^k-1>1,./ᙠ6Ḅ94.A(1,0),C(0,k-1),♦.♦஺Ḅ☢qU2,3..▲xix(A-1)=2,23+k=K,3ᦑYᱥ[Ḅ⊤vg2y=/-Zx+2.33ூD௃⚪ὃHIYᱥ[\X7Ḅ`.ᦪy=af+6ᡝc(a,b,cUᦪaWO)\x7Ḅ`ᙶ᪗⚪ᓄ2+ᐵR”Ḅᐗ=^-4acYᱥ[\x7Ḅ`_ᦪ.=^-4ac>0Yᱥ[\x7ᨵ2_`=4-4ac=0Yᱥ[\x7ᨵ1_`=4-4ac<0Yᱥ[\x7ᨵ`.ὃHInoᦪḄ¡.23.ூᑖ᪆௃(1)ᵫ£¤noJḄឋ|NQNC=60°,¨ᵫ©|ᩩ«¬noJᑁo¬ᳮcd//=AFEC,¯cd'°£(».

20(2)ᵫ³noJḄឋ¬©|ᩩ«´ᵫµ30°oḄ¶onoJḄឋ'=·ᑗᓽ2¹º.ூ+,௃(1)cd...?!zU£¤noJ..N8=NC=60°,,4NDEF=60°,ADEF=ZB,U½Ḅ᜜o/DEC=/¿/Àᓽ4DEF+4FEC=NB+/BDE,:DEF=/B,:.NBDE=4CEF,,NB=ZC,:ZDEsMCEF,.BDBE-----,CECF4.BE'CE=BI>CF-,(2)+.'4/\BDE^/\CEF,.BDDE-=,CEEF,DE=EF,ᓽÁ=1EF:.BD=CE,'DEBC,N⚚=90°,N6=60°,:•ZBDE=30°,

21:.BE='BD,2.BEBE1=="ECBD'2'ூD௃⚪ὃHI³noJḄᑨ\ឋஹnoJḄ᜜oឋஹ£¤noJḄឋஹµ30°oḄ¶onoJḄឋÄÅOP£¤noJḄឋcdnoJ³U+⚪ḄᐵV.24.ூᑖ᪆௃(1)᪷⚪N¬Æᨴ├ÉÊy\├ÉᓫÌxÍÎḄᐵÏ2Ð-5ᡝ150,/ᑏÆᨴÓḄᑭÕÖᐗ\├ÉᓫÌxÍÎḄᦪᐵÏg(2)᪷(1)3ḄᦪᐵÏgᯠØ:ᐸᓄ2⚔gᯠØ᪷ᦪḄឋᓽ├ÉᓫÌ2ÛÜᐗÆᨴÓᨬᜧᑭÕᨬᜧᑭÕ2ÛÜᐗ.ூ+,௃+.(1)ᵫ⚪N(x-10)y=(%-10)(-5ᡝ150)=-5f+200x-1500,ᓽÆᨴÓḄᑭÕᵬᐗ\├ÉᓫÌxÍÎḄᦪᐵÏg2--5A200x-1500(2)Vw=-5x+200x-1500=-5(x-20)2+500,...âx=20ÖãᨬᜧsEᱏ500,,.â├ÉᓫÌ220ᐗÆᨴÓᨬᜧᑭÕᨬᜧᑭÕ2500ᐗ.ூD௃⚪ὃHᦪḄ'ᵨ+,⚪ḄᐵVUdæ⚪NᑭᵨᦪḄឋ+,.25.ூᑖ᪆௃ᐜᜋ·Ḅéêëᙠᙢ☢·ḄíÁ¨îïᩚḄêÁAñ᪷òóᱥê\éíᡂõ<ᑡᐵÏgḄsᓽ.ூ+,௃+.îᜋ·Ḅéê2ñëᙠᙢ☢·ḄíÁ2xñïᩚḄêÁ2ñ÷óøí21ñḄùúéí20.8ñᜋ·Ḅéê22ñ+x=1.6(ñ)0.8x᪛Ḅéí2:1.6+10=11.6(ñ)^ߟߟ---,+=14.5(ñ).0.811.6,.þ᪥ᩚḄ14.5.ூ௃⚪ὃḄḄᵨ⚪Ḅᐵ!"#$ᩚḄ%&'⚪Ḅ᧕┯.

2226.ூᑖ᪆௃(1)᪷./Ḅᙶ᪗2ᔠ45Ḅ&67$6Ḅᙶ᪗8(2)᪷.48Ḅᙶ᪗ᑭᵨ:;<ᦪ>ᓽ6#$@ᱥ4Ḅ⊤CD8(3)E@ᱥ4Ḅ⊤CDFG⚔IJKᐭM6Ḅᙶ᪗#$fḄNO2ᔠPᓽ67$QR@ᱥ4S454?ᨵUVᨵWXYᐳIMḄ[N].ூ௃Q(1)84Ḅᙶ᪗G(-4,-2),E1ᔣ_`a6Xᓫc&7ᑮ6,.•.6Ḅᙶ᪗G(-4+6,-2),ᓽ(2,-2).ফE4(-4,-2),8(2,-2)Kᐭy=-f+6gc,7QJ-16-4b+c=-2,I-4+2b+c="27Qb=-2,Ic=6@ᱥ4Ḅ⊤CDGy=2x+6.(3)•..@ᱥ4y=-x+bx+cḄ⚔ᙠs4y=^2tau.••@ᱥ4Ḅ⚔ᙶ᪗G(t,t+2),.••@ᱥ4Ḅ⊤CD6ᓄGy=-(x-f)2+1+2.E-4,-2)Kᐭy=-(x-M2+w2,7Q-2=-(-4-t)ஹw2,7Qti=-3,t=-4,2y••@ᱥ4S45zᨵUVᨵWXYᐳ-4WtV-38E4(2,-2)Kᐭy=-(x-t)2+^+2,7Q-2=-(2-f)"+t+2,7Q£3=0,ti=5,y,@ᱥ4S45ᨵUVᨵWXYᐳ•.0V0W5.{t6|1Ḅ[N]G-4WY-3ᡈ0஽5.

23ூ௃⚪ὃḄᙶ᪗Fᓄஹ:;<ᦪ>#ᦪ᪆DஹᦪPtḄᙶ᪗ᱯWᐗ⚪ḄᐵQ1᪷.ḄFᓄ$8Ḅᙶ᪗82᪷.48Ḅᙶ᪗ᑭᵨ:;<ᦪ>#$@ᱥ4Ḅ⊤CD83Kᐭ48Ḅᙶ᪗#$/Nᑭᵨᦪ2ᔠ$tḄ[N].27.ூᑖ᪆௃1ᵫ“521S”6z67/G£=/Mᵫ᜜ឋ67282ᵫ;ᳮ67ᵨ=/#+a?=c/f+HJs,Ad=A#+af,=+6728
3E46=11,=7,4?=14,Kᐭ2ḄD6#Ḅ&ᵫ“SIS”6',ᱥ67==12.ூ௃Q1ᵫ⚪¡67Q¢SᑗḄ¤¥:E45§¨6⌮I┐«¬90°7ᑮ45;:.BD=BE,NEBD=9Q°=NABC,4.NABE=/CBD,QAB=BC,BE=BD,4./\ABE^/\CBD(S4S)NBAE=/BCD,

24,ZZAHD=NACfKZCA//=ZACB+ZBCIhZCAII,4.NAHD=NBAE+NCAᩔNACB=9Q஺,4.AEVCDx(2)᝞P±²/஻CE,DE,"4AELCD-.:.A4=A#+Dk"=+ῗµ=¶+ᑣ,4.Alf+CEt=Aff+Dl/+C/f+HEt=A^+D^,■:NABC=9Q°=/DBE,AB=BC,BE=BD,4.AC=2A^,DB=2Bb,:.A4+X=2AE+2B!h(2)᝞P±²¸ᵫ(2)6|ᡄ+º=2»+2196+½=2X121+2X49,4.CE=\2,:¿Aᐵ¥s4ÀḄÁÂF,

25:AB=BF=BC,/ABN=/BFN,■:/CBE“ABN=9y,N/®Å/99=90°,:/CBE=/FBD,@•4BC=BF,BD=BE,4./\CBE^/\FBDSIS4.DF=CE=\2.ூ௃⚪ÉÊFᣚ{ᔠ⚪ὃᐰḄᑨ;Îឋ;ᳮῪsḄឋᑭᵨ;ᳮÐÑ+Ò=2Ó+2Ḅᐵ.28,ூᑖ᪆௃1a=b=-2,ᦑ@ᱥ4Ḅ⊤CDGQy=/-2x-2,ᦑᫀGQy=7-2^-28EMஹ஻ᙶ᪗KᐭÛ7Qa=-2,6=-1082জs4ᯠḄ⊤CDGQÞ2x+2,¢᜛à2ᾢ2,ᑣ@ᱥ4Ḅ⊤CDGQy=V+mx+2Ẅ2,⚔GQ--in,-—m+2/7^2,ᓽ6#824ঝ᝞Pᡠä஺@ᱥ4æᙠ/%ᑁéGᡂ5ᓽ6#.ூ௃Qপa=8=-2,ᦑ@ᱥ4Ḅ⊤CDGQy="?x-2,ᦑᫀGQy=x-2^r-28E/ஹ6ᙶ᪗KᐭÞagZ?Û7Qa=-2,b=-10,ᦑᫀGQ-2,-1082জᵫð஺Ḅᙶ᪗7s4/CḄ⊤CDGQy=2x+2,¢஻ᜐ2Ẇ2,ᑣ@ᱥ4Ḅ⊤CDGQÞᡝᵪ2Ẇ2,⚔GQ-ö/஻ᓣ2,24øx=--m,ᑣm=-2x,2ᑣy——öú+2Ẇ2=-x-4û2,4

26ᓽ@ᱥ4QḄ᪆DGQy=-f-4ᡝ28ঝ᝞PᡠäQ@ᱥ4æᙠ/þᑁéGÿ,ᱥ/CḄ£(0,2)y=-2ᓽy=-x-4J+2=-2,x=-2+2&,ᦑ(-2+2A/2,-2)ᦑ0<%<-2+2᝞ᵫজ%a—m--2x,ᦑ4-4'