西藏拉萨市2019-2020学年中考数学三模考试卷含解析

《西藏拉萨市2019-2020学年中考数学三模考试卷含解析》由会员上传分享，免费在线阅读，更多相关内容在教育资源-天天文库。

⃬2019-2020ὃᦪὃᔁஹ⌱⚪ᜧ⚪ᐳ12⚪⚪4ᑖᐳ48ᑖ.ᙠ⚪Ḅ!⌱⚗#ᨵ⚗%&ᔠ⚪(⌕*Ḅ.+1.,ᑡ.ᦪ/0ᳮᦪḄ%+1LA.-B.J2C.-5D.0.315632.3ᖪ56789:ᢥᡂ=>?40%@᪗=BC8ᢚᓽᢥ᪗=Ḅ80%FGᓬIJKL9:MNOᑭ15ᐗᑣS89:KḄᡂ%+A.120ᐗB.125ᐗC.135ᐗD.140ᐗ3.᝞UᙠVABCNAED=NB,DE=6,AB=10,AE=8,W!JBCḄYZ/()4.,ᑡᔜ^_/`aᦪḄ%+A.(—3)2b-3?B.(—3)2b3?C.(—2)3b—23D.|-213^|-23|5.᝞UcdeABCDḄfY/3cm,ghPiBhjC3cm/sḄkZlḼfBC-CD-DAngᑮpAhqrngstghQuviBhjClcm/sḄkZlḼfBAᔣAhngᑮpAhqrng.xPhngvy/x
s,ZkBPQḄ☢{/y
cm2,ᑣyᐵ}xḄ~ᦪU%+6.᝞Uᙠ!feABCDNABCḄᑖBFAD}hF,FE஻AB.AB=5,AD=7,BF=6,ᑣ!feABEFḄ☢{/+BC

1A.48B.35C.30D.247.᝞UhA(1,0),B(0,2),CAB/fᙠ▲ᑁLcdeABCD,CDy}hG,CDG/fᙠ▲ᑁLcdeDEFG,a~ᦪy=2ḄUhE,ᑣkḄ%()x(A)33(B)34(C)35(D)368.,ᑡᜧḄ᪥Uᫀ%UeḄ%()9.b᪍ᙠ᝞UজᡠḄ⍝¡4¢50£ᢚ¤.ᙠ᦮¦§ὅ©ªḄ©«)(ᓫ®m)§vy/(ᓫ®S)Ḅ°ᐵ±᝞Uঝᡠ.,ᑡ³´cµḄ%().ª■1------------50m,UজA.·¸iªuvjuvᑮp¹hB.ᐰ¦ḄᙳkZᜧ}᪍ᐰ¦ḄᙳkZC.¼15sḄ½¦ᜧ}᪍¼155Ḅ½¦D.᪍ᙠᨬ@100᪷Ḅ¦`⍗2Á10.ÂÃÄᜧ᫑(¼%ᐰÆÇᨬYḄÈÉᜧ᫑ᐸËÌͦ“É᫑Ï”ᐰY35578£ᦪÑ35578ᵨÓÔᦪÕ⊤/()A.35.578x103B.3.5578xl04C.3.5578x10sD.0.35578x10s11.×ØÙÚÛÜ%ÝÞßᦪḄà⌕℉Ld¦Û%âḄᨬ?ᡂãᐸÔä®åᨵæçஹèéêᓝ·sæéஹèçêì·஺î®æஹèᔜêïðñòᦻ®“Ꮇxᨵ5ᜮæஹ2#èê10·s2ᜮæஹ5#èê8·஺î®ᜮæஹ#èᔜêö÷·ñ”xᜮæêx·#èêy·ᑣᑡd¦ø┯úḄ%()

25x+2y=10[5x+2y=10[7x+7y=18[5x+2y=8A.4B.5C.5D.<2x+5y=8[7x+7y-18[2x+5y=8[2x+5y=1012.ᙠVABCADbBE%?ZABE=45°,hF%ABḄhADFE,BEᑖû}hGஹH.ZCBE=ZBAD,ᨵ,ü1JIý®জFD=FEঝAH=2CD(3)BC»AD=72AE2©SABEC=SAADF.ᐸA.1B.2C.3D.4éஹþÿ⚪
ᜧ⚪ᐳ6⚪⚪4ᑖᐳ24ᑖ.13.ᙊ┵☢ᙊḄ3,4,Ḅ☢ᶇᐔ.14.!"
᝞$%ABCᑁ'OO,(OC_LAB,)DᙠOBḄ+,-.(NA=NBCD=30஺,AC=2,ᑣᵫBC-3CD4-3BDᡠ6ᡂ$8Ḅ▢:;ᑖḄ☢<.-3x>-615.=>?x-lḄᨬᜧ᦮ᦪC----->X16.᝞$<᪷5m,ḄEF

3᦮.1¿ÀÁ³᪵µ¶Ḅ°ᨵÂÃÄÅ2¸»¼=¾᦮Ḅ$⊡ᐙ¾᦮;3É°Wᨵ8000ÄÊËg᰿ᔛDḄÄᦪ;4Éᨵ᜜;ᐰϨḄAஹBஹCஹDᔜ<ÑÒÓÔᔛ».ᵨᑡ⊤ᡈÖ᪛Ø$Ḅ[Ù,ÚÛÜÝᔛᑮḄា`YCḄᭆ᳛.21.6ᑖᐜᓄãäÚf
1-©ᓝÝtç.2,ᐸéx=l.X+lx2-\22.8ᑖ᪥ëìẆîï᪥ðñḄòóST®ôõ³᪵µ¶Ḅ[Ùö▅øஹùTஹúûஹᐸÛ¦[☢µ¶ÉüýðñḄᐶÿ᰿
Ḅᑴ᝞Ḅ᦮Ḅ᪷Ḅ!ᑡᔜ⚪%1ᙠ'(Ẇ*+ᐳ-./0122“ᐸ5”ᙠᡧ8ᡠᓰḄᙊ<=>-.?23⊡ᐰ⚣ᦪᑖEFGH4I᪥ᐳᨵ320/01L+ᐰ᪥ᜧNᨵ-.01OP᰿
>▅R.23.8ᑖT᝞UVA,BWᙠᦪXYWA⊤[Ḅᦪ\-10,OB=3OA,WM]^_3`ᓫbc?Ḅd?eWAᔣghi.WN]^_2`ᓫbc?Ḅd?eWOᔣghijWMஹWNlmnoTᦪXYWBpqḄᦪ>.rst_WMஹWNᑖuᑮwWOḄxyz{2A0B----------1------------1------------------------------------1—>-10024.10ᑖT|n}(~ᦪy=x-1Ḅ.

425.
10ᑖTABᨵ+Ꮇᐸᚁ?\i=lᚁᚁ☢YEWᜐᨵ+ᎷᚁCxyBC=30xyCE=18e⚔EWḄ=\45஺ABḄ.j%ᚁ?i>ᢣᚁ☢ḄF??ḄT26.
12ᑖT¡ᔠ£¤--¦§Ḅᦪ0¨⚪©ª%ᙠ+(¡ᔠ£¤«iOYl0¬]`8\pẆ*z®8¦§Ḅ¨⚪%UV8ABCDs8ABO,¯¬ᔜ°p=±Ḅ²W³ᔠ´WO,µ¶AACC.·5¬¸ᑡ¨⚪:º»o¼%D᝞1,½AB஻AB,ᑣAACCḄᦪ¿ᐵÁ>HÂÃÄ*%21Ḅ8ABCDÅᢝi8ÇY0ÈW0⌮m┐¦§=?&j0஺ீ<90஺T,᝞2,ᙠ8ABCD¦§ḄsÎ1ḄÏÐᡂÒᔩ2½ᡂÒÔÕH½ᡂÒÖÕᳮᵫHÂÃÙ%3᝞3,ᙠ2ḄᩩÛÜ8ABOÈWO¦§ÝAAÞADm½AB=6,BC=8,27.
12ᑖT᝞ßᱥ±y=x2+bx+cxX²´WA
-1,0,B
4,0yX²´WC,WDWCᐵ´xXpáWP>xXYḄ+`iWâWPḄᙶ᪗\m,0,sWPÃxXḄᚖ±1,²ßᱥ±WQ.ßᱥ±Ḅ᪆çHÜWPᙠ±èOBYhimF±1²BD´WM,éÄ*m\êëmìí8CQMD>îìí8HᙠWPhiḄsÎᙶ᪗☢ᑁ>ᔲñᙠWQ,òABDQ>]BD\F=íḄF=ó=82½ñᙠF¶ᑏnWQḄᙶ᪗H½ñᙠÖÕᳮᵫ.

5õὃ!ᫀ+ஹ⌱ù⚪(ûᜧ⚪ᐳ12`⚪^⚪4ᑖᐳ48ᑖ.ᙠ^⚪ünḄì`⌱⚗þᨵ+⚗>ÿᔠ⚪⌕Ḅ.)1.Bூ᪆௃ூᑖ᪆௃᪷ᳮᦪḄᓽ.ூ௃⌱⚗Aஹ3ᑖᦪᨵᳮᦪ⌱⚗Bஹ0ᳮᦪ⌱⚗Cஹ-5ᨵᳮᦪ⌱⚗Dஹ0.3156ᨵᳮᦪᦑ⌱B.ூ!"௃#⚪ὃ%&ᳮᦪḄᑨ()ᳮᦪ▲+,-.ᦪ/0⚪Ḅᐵ2.2.Bூ᪆௃3⚪ᑖ᪆456ᳮ⚪7)#⚪Ḅ89ᐵ:ᓽ;<=>?@Aᑭ=ᢥᡂ#FGH40%I᪗FKL8ᢚᓬO᪷PQR89ᐵ:ᑡOTUV.4WPX>?;<Ḅᡂ#xᐗ᪷⚪7ᑡTUZ4x+15=(x+40%x)x80%PRTUZ4x=125ᑣPX>?;<Ḅᡂ#125ᐗ.

6ᦑ⌱B.ὃᐗḄᵨ.3.Aூ᪆௃VZAED=ZB,ZA=ZA.,.ADE<^AACB.AE_DE••-9ABBCVDE=6,AB=10,AE=8,•86••=~,10BC»15BC=—.2ᦑ⌱A.4.Aூ᪆௃ூᑖ᪆௃᪷Ḅᑣᯠ᪷!ᨵ#$%&Ḅ'(ᦪ*+,-ᦪ./ᫀ.ூ1௃A.(3-=9,-312=-9,ᦑ(3343?*+,-ᦪᦑ567B.(-3)2=9,32=9,ᦑ(-3)2432%D*+,-ᦪᦑ┯C;C.(-2)3=8,-23=-8,ᦑ(-2ᨴ423%D*+,-ᦪᦑ┯C7D.|-2G=8,H2,H8ᦑ|-2G4H23ᝰD*+,-ᦪᦑ┯C.ᦑ⌱A.ூJ௃K⚪ὃMNᨵᳮᦪḄ4,-ᦪḄPQᐵSDTUᨵᳮᦪḄVᑣ.5.Cூ᪆௃W⚪ᑖ᪆ᵫ⚪Y.BQ=x.Ij3জOWxSl8PᙠBC:;BP=3x,ᑣABPQḄ☢==-BPBQ,y=-᝞"=/ᦑA⌱⚗┯C;222113ঝl

7ji93ঞ2VxW3]P!ᙠAD_`AP=9-3x,ᑣABPQḄ☢b=cAPBQ,y=c•(9-3x)x==-x--x22222ᦑD⌱⚗┯e.ᦑ⌱C.ὃ!4f!0⚪Ḅgᦪhi.6.Dூ᪆௃ᑖ᪆4✌ᐜlmn_oABEFpo᪷qrᳮOstuAEḄvwxyZOn_oḄ☢b.4VAB/7EF,AF஻BE,zn_oABEF{|n_oBF{ᑖNABC,zn_oABEFpo}~AEBF!O,VBF=6,BE=5,
BO=3,EO=4,.AE=8,ᑣn_oABEFḄ☢b=6x8+2=24,ᦑ⌱D.!"4#⚪⌕ὃ%ḄpoḄឋLᑨᳮ8wḄ⚪./#⚪Ḅᐵ2᪷⚪7ZOn_opo.7.Dூ᪆௃3⚪ᑖ᪆46!E=EMJ_OA,ᚖM,VA(1,0),B(0,2),.,.OA-1,OB=2,KNAOB=90஺,12/.AB=VOA+OB=A/5,VAB//CD,.\ZABO=ZCBG,VZBCG=90°,AABCG^AAOB,=,VBC=AB=A/5,ACG=2V5,VCD=AD=AB=A/5,/.DG=3A/5,.
.DE=DG=3⌲,OBOA
AE=4⌲VZBAD=90°,AZEAM+ZBAO=90°,VZBAO+ZABO=90°,zNEAM=NABO,KAEEMAM475EMAMVZEMA=90°,.,.EAM^AABO,:.——=-------=--------,ᓽc^=-----=-----,
AM=8,ABOAOBV512EM=4,
AM=9,AE(9,4),.,.k=4x9=36ᦑ⌱D.ὃ!4gᦪᔠ⚪.8.Bூ᪆௃ூᑖ᪆௃

8᪷shoḄᭆsᔜ⌱⚗ᑖ᪆ᑨᓽZ.ூ௃4Aஹ+shoᦑ#⌱⚗┯eBஹshoᦑ#⌱⚗Cஹ+shoᦑ#⌱⚗┯eDஹ+shoᦑ#⌱⚗┯e.ᦑ⌱:B.ூ!"௃#⚪ὃ%&shoḄᭆshoḄᐵ2shoQᑖᢚ¡I¢ᔠ.9.Dூ᪆௃ூ௃A.ᵫh¤O.᪍ᐜᑮ§!A┯eB.ᐰU©Uc᪵.᪍ᵨ]¬ᡠL.᪍Ḅ{ᙳ¯wᜧ.±Ḅ{ᙳ¯wB┯eC.²15³].±´µ¶!·¸Q¹ºᙠ»¼¶!Ḅ6U½ᑨ.᪍¾Ḅ©Uᜧ.±¾Ḅ©UC┯eD.ᵫh)QᩩuḄ!Q¹À⍗Ḅ!ᡠLÀ⍗&QÂ.ᦑ⌱D.10.Bூ᪆௃ூᑖ᪆௃ÃÄÅᦪÆax10",Ç14È10,nÉᦪḄ᦮ᦪËᦪÌc.ூ௃435578=3.5578x1()4,ᦑ⌱B.ூ!"௃#⚪⌕ὃ%ḄᑭᵨÃÄÅᦪÆ⊤ηᜧḄᦪÏẠ⚪.ᳮÃÄÅᦪÆḄ⊤ÎTÆ⚪Ḅᐵ2.11.Dூ᪆௃ூᑖ᪆௃ᵫ5ᜮÒஹ2ÓÔÕÖ10QZ45x+2y=10,ᵫ2ᜮÒஹ5ÓÔÕÖ8QZ2x+5y=8,ᑣ7ᜮÒஹ7ÓÔÕÖ18Q½)7x+7y=18,½Zᫀ.

9ூ1௃^_ᜮabcX'_!dbcy'ᵫ5ᜮaஹ2!dbc10'.5x+2y=10,ᵫ2ᜮaஹ5!dbc8'.2x+5y=8,ᑣ7ᜮaஹ7!dbc18'f.g7x+7y=18,5x+2y=8ᡠijீ┯C,2x+5y=10ᦑ⌱D.ூJ௃K⚪m⌕ὃMᵫo▭q⚪rstuᐗj⚪ḄᐵSDᳮ⚪Yvᑮ,xᐵyzx{Ḅ|Kឋ~.12.Cூ᪆௃ூᑖ᪆௃᪷⚪Y4.iᑨᔜ⚪ḄDᔲᡂ.i/K⚪.ூ1௃.,ᙠAABCAD4BEDAZADB=ZAEB=ZCEB=90°,,FDABḄ11.,.FD=-AB,FE=-AB,22.♦.FD=FE,জ567VZCBE=ZBAD,ZCBE+ZC=90°,ZBAD+ZABC=90°,.•.ZABC=ZC,AB=AC,VAD±BC,/.BC=2CD,NBAD=NCAD=NCBE,ZAEH=ZCEB

10ABADan——=——ᓽBCAD=ABBE,BCBEVZAEB=90°,AE=BE,
AB=&BEBC»AD=^/2BEBE,.,,BC«AD=V2AE2ঞWAE=a,Ú!]AB=&a,CERE2CE6a-fl_2-V22BEC°ABCACBE—AC—a22ᓽS^^SABCVAF=-AB,2•,ABD=]SABCSABEC^SAADF,ᦑট┯eᦑ⌱4C.ூ!"௃#⚪ὃ%ÀÜÝtoḄᑨÞឋஹᐰ8ÝtoḄᑨÞឋஹßtÝtoà_`Ḅu#⚪Ḅᐵ2m⚪7Oᡠ0⚪◤⌕Ḅᩩ<ᑭᵨᦪoâᔠḄãä.zஹåæ⚪4ç#ᜧ⚪ᐳ6R.⚪;.⚪4ᑖᐳ24ᑖ.é13.157tூ᪆௃ூᑖ᪆௃᪷ᙊḄ☢bëìஹᡧoḄ☢bëìÅîᓽ.ூ௃ᙊ┵Ḅðuv=ñ+=5,,ᙊ┵ò☢ᙊḄ☢b=9ᐔᙊ┵ò☢ᙊḄᕜv=2xnx3=67r,ᓽᡧoḄõv6”,ᙊ┵Ḅö☢÷øhḄ☢b=1x67rx5=15n,2ூ!"௃#⚪ὃ%ḄᡧoḄ☢b(ùúûᡧoüᙊḄ☢bëì⚪Ḅᐵ2.

1114.273--n.ூ᪆௃W⚪ᑖ᪆᪷⚪Y.ZO=2ZA=60°,ᑣAOBC+x:᪷NBCD=30஺.NOCD=90஺,OC=AC=2,I]CD=2V3>SOCD=2x26x~=2G,SᡧOBC=~~~n,US▢—26.15.-1.ூ᪆௃ூᑖ᪆௃ᑖt_(%x{Ḅ᪷&ᜧᜧஹ&ஹᜧᜧ¡vஹᜧᜧ¢N6P%x{jḄtᐸᨬᜧ᦮ᦪ.ூ1௃—3x>-6জ;>ᵪI2%x{জxlx,x-lx>L-x>l,xVL:.%x{jḄ+xV-1,%x{jḄᨬᜧ᦮ᦪ+-Lᦑ/ᫀ+௃ூJ௃K⚪ὃMNᐗ%x{jḄ᦮ᦪ⚪ḄᐵSD©ªḄTUᐗ%x{jḄ᦮ᦪ.2«12ூ᪆௃W⚪ᑖ᪆᪷⚪Y.gdḄᨬᜧ¬®¯+°±+5,ᙊ³´ᦪ+90஺Ḅᡧ4°±+1,ᙊ³90xrx2560x7rxl77+60஺Ḅᡧᑣ5=-------1------=--7136036012JK⚪m⌕ὃMḄµDᡧḄ☢=¶{·¸¹ᓫ⚪».K⚪⌕ᱯ½YḄµDᙠ¾Ḅ¿À8ᡠ᪀ᡂḄᡧḄᙊ³´ᦪ4°±ÂÃÄtDÅÆ(q⚪ḄᐵS.ᙠᡧḄ☢=8ᡃÈP⌕Éᙊ³Êᐭ᝞Ì⚪ÍtÎḄDᙊᕜᑣᡃÈ◤⌕tᙊ³Ḅ´ᦪᯠÑ.

1217.1-ᡈ-1ூ᪆௃ூᑖ᪆௃ßuy=kx+4Þþᱥy=-x4x+l(-l+-^2—>/3=V2ᦑ[ᫀ9J.ூ]௃^⚪ὃ`bc᪷Ḅ{|⚪Ḅᐵ{ᵨbc᪷Ḅ{|}ᑣ.

13ஹ/⚪(Kᜧ⚪ᐳ9(⚪ᐳ78ᑖ/ᑏtᦻÕÖ×ஹØ×ÙᡈÛÜÝ.19.-1ூ᪆௃ூᑖ᪆௃ÞßᑭᵨáâbḄឋ~izᱯãḄäᦪbஹå᦮ᦪᢣᦪçḄឋ~ᓄ¹t/ᫀ.ூ1௃é{=1+ê—l-2xë+(—1)=—1.ூJ௃ὃ᪶gîäᦪïᔠV.56DᐵS.20.(1)600(2)ñ᪆(3)3200(4)-4ூ᪆௃(1)60+10%=6()0(ò)./Kôõr᪵÷MḄøùᨵ600ò.(2ᑖ)(2)᝞7...(5ᑖ)(3)8000x40%=3200(ò)./úøù®ᨵ8000òû᰿ᔛDþḄòᨵ3200ò.…(7ᑖ)(4)᝞ABCDAAAABCDACDABDABC(ᑡ⊤ᶍ᯿ᑖ).…(8ᑖ)P«)ᜓ!ᔛᑮḄា!"CḄᭆ᳛"%…(10ᑖ)121.-5

14ூ᪆௃ூᑖ᪆௃⚗ᑖᑭᵨᑖᑖḄ}}ᑣ|ᑭᵨ◀}}ᑣfjᑖ3ᑮᨬ:XḄ#ᐭ|ᓽ!#.ூ/௃2x+2—x+1(x+l)(x_1)x+3(x+l)(x_1)1x+1(x+3)2x+1(x+3>+32-11&x=l=—=C2+35ூ]௃^⚪ὃ`aᑖḄᓄ#{|}ᑣ[^⚪Ḅᐵ.22.(1)¡`¢ᦪ100¢o(2)ᙠᡧj¤“ᐸ§”©Ḅᙊ«¬36஺o(3)⊡ᐰ⚣ᦪᑖ°<±᪆o(4)²³;ᐰ᪥µ¶᰿▅¹Ḅº»9960.ூ᪆௃ூᑖ᪆௃(1)ᑭᵨ¼½{¾Ḅ¢ᦪ◀IᐸᡠᓰḄÀÁᓽ3Âc¡`Ḅ¢ᦪo(2)ᵨ360஺ÃI“ᐸ§”©Ḅ¢ᦪᡠᓰḄÄᑖÀᓽo(3)3“ᐸ§”©Ḅ¢ᦪஹ“ÆÇ”©Ḅ¢ᦪ⊡ᐰ¤ᓽo(4)ᵨ¢ᦪÃIµ¶᰿▅¹Ḅº»¢ᦪᡠᓰḄÄᑖÀᓽ.ூ/௃(1)Èᩩj¤3!¼½{¾Ḅ¢ᦪ920¢ᡠᓰḄÀÁ920%,b¡`¢ᦪ=20+20%=100¢o(2)¼½ÆÇḄ¢ᦪ=100x40%=40¢Èᩩj¤3!¼½▅¹Ḅ¢ᦪ930¢...“ᐸ§”©Ḅ¢ᦪ=100-40-30-20=10¢ᡠᓰÀÁ=10+100=10%,ᙠᡧj¤“ᐸ§”©Ḅᙊ«¬=360x10%=36°(3)᝞10▅¹{¾ÆÇᐸ§⚗Ê

15(4)²³;ᐰ᪥µ¶᰿▅¹Ḅº»93200xË=960(¢).ூ]௃^⚪ὃ`aᩩj¤ஹᡧj¤ḄÎᵨÈᩩj¤ஹᡧj¤ÏÐÑ⌕ḄÓÔÕÖ⚪Ḅᐵ.23.(1)1;(2)L'2×ᡈ2×MஹNᑖᑮOḄØÙ
ூ᪆௃Ú⚪ᑖ᪆1(D᪷zOB=3OA,ᔠBḄÛÜᓽ3!BqÎḄᦪo(2)ÝL'x×MஹNᑖᑮOḄØÙ
Þ!MஹNqÎḄᦪßᑖMஹNᙠOàáMஹNâᔠãäåὃ⇋᪷zMஹNḄᐵçᑡ!ᐵéxḄ³ᐗ³c<ëìᓽ3!í.Ú⚪᪆1(1)VOB=3OA=1,.IBqÎḄᦪ1.(2)ÝL'x×MஹNᑖᑮOḄØÙ
"MqÎḄᦪ93x-2,NqÎḄᦪ92x.জMஹNᙠOàᑣ2-3x=2x,3x=2ঝMஹNâᔠðñJ,3x-2=2x,3x=2.ᡠIL'2×ᡈ2×MஹNᑖᑮOḄØÙ
.24.±᪆ூ᪆௃ூᑖ᪆௃✌ᐜ3⚔ᙶ᪗9(1,0),ᯠnᑭᵨqõឋᑡ⊤ßøùᓽú!ûEᦪḄ.ூ/௃ᑡ⊤31X


-10123•

y


41014


᝞:

16J'Axூ]௃"⚪ὃ`abcEᦪḄ.ýþÿ
ᦪḄ⚔ᙶ᪗ᐵ.25.(39+9).ூ᪆௃ூᑖ᪆௃EEF_LBCḄF,EH_LABH,᪷CE=20ᚁ!i=lᑖ"#$EFஹCFḄᙠRSAEH'#$AH,()*+,-ABḄ..ூ/௃0EEF_LBCḄF,EHLABH,EF_1ᙠRtACEF',=tanZECF,'=ὡ:.ZECF=30°,.,.EF=CE=10CF=1()7^.*.BH=EF=10HE=BF=BC+CF=(25+106)ᙠRSAHE'VZHAE=45°,AAH=HE=(25+1073)/.AB=AH+HB=(35+1073).30,-ABḄ.!(35+10J3).F45ᙢ☢ூ8௃

17*⚪ὃ-./0102Ḅ3ᵨ-60708⚪ᚁ:ᚁ08⚪;<ᭆ=>?@A"*⚪Ḅ.⚪ᐵC.26.(1)AA=CC(2)ᡂEFGH.᪆(3)
-32ூ.᪆௃ூᑖ᪆௃(1)LMACஹACS᪷P⚪QRᑮSAஹA\C\CᙠUVᩩ/X%᪷PY2Ḅឋ[RᑮOA=OC,OA^OCSRᑮᫀ(2)LMACஹATSFG]AOAg/kUOC,᪷Pᐰ_102Ḅឋ[FG(3)LMAC,`CaCEJ_ABbABḄcdXeE,᪷Pfghi2Ḅឋ[jkBC,᪷Plmnᳮ@Aᓽq.ூr.௃(1)AA=CCSᳮᵫ᝞tLMACஹA'C,1•Y2ABCDsY2A'B'C'DZCAB=ZC,A,B,,•.'A'B'஻AB,.•.SAஹA\C\CᙠUVᩩ/X%ᵫY2Ḅឋ[qvOA=OC,OA^OCS.,.AA,=CC,,ᦑᫀxA,A=CC(2)(1)yḄz{|ᡂEAA=CCSᳮᵫ᝞tLMACஹACᑣACஹAC~`SO,ᵫḄឋ[qvNAOA=NCOC,■:i2ABCDi2ABO~"Y2,.*.OA=OC,OA'=OC',

18ᙠ4909:4COC',OA=OC[ZA'OA=ZC'OC,04=0C.•.A'OABUOC,...AA=CC(3);?ABCDs>?ABCDABBC68..----=-----,ᓽnnC=-----,A'B'B'C3B'C"+B'C'=4,VZEB,C=ZB,C,C=ZE=90°,...DE?BECC!>?.,.EC=B,C,=4,ᙠRtAABC'AC=7AB2+BC2=10»ᙠRtAAEC'AE=7AC2-C£2=2A/21>.,.AA,+B,E=2V21-3,FAA=CC=BE,.GG2V21-32ூ8௃H⚪ὃKḄ>?ḄឋMஹNOPᣚḄឋMஹᐰSTU?ḄᑨW:ឋMXYNOPᣚḄឋMஹ>?ḄឋM⚪Ḅᐵ.1,327.(1)y=-x2CCX—2;(2)Zm=2[DE?CQMD!5\DE?;(3)Qi(8,18)ஹQ2(-1,0)ஹ22Q3(3,-2)ூ᪆௃ூᑖ᪆௃(1)^<_A(-1,0),B(4,0)`ᐭbᱥy=gx2+bx+cdeᓽ*f

19(2)ᵫ(1)yḄ.᪆RkSCḄᙶ᪗C(0,-2),'RkSD(0,2),jk/XBDy=-1x+2,1131SM(m,----m+2),Q(m,—m2-----m-2),qRMQ=-----m2+m+4,᪷Pi2Ḅឋ[qR2222QM=CD=4,BP--m2+m+4=4q.Rm=22(3)ᵫQ"BDx/0iḄ/0102ᡠᑖ{জNBDQ=90஺ᑣBD2+DQ2=BQ2,ᑡkqjkQi(8,18),Q2(-1,0),ঝNDBQ=90஺ᑣBD2+BQ2=DQ2,ᑡkqjkQ3(3,-2).ூr.௃(1)ᵫ⚪Qv,•SA(-1,0),B(4,0)ᙠᱥXy=yx2+bx+c%,1,--b+c^03j.R2—X42+4/>+C=0c=-2[211,3.•.ᡠjᱥXḄ.᪆xy=-x2-^-x-2221,3(2)ᵫ(1)vᱥXḄ.᪆x^/V1%V2,x=0,Ry=-2SCḄᙶ᪗xC(0,-2)••,SD¡SCᐵex¢£¤.••SDḄᙶ᪗xD(0,2)/XBDḄ.᪆xy=kx+2¥B(4,0)0=4k+2,.Rk—----2/XBDḄ.᪆xy^-x+22•••SPḄᙶ᪗x(m,0),`SPax¢ḄᚖX1,bBDeSM,bᱥX¡SQqSm,-g஻?+2f123CQIzn,—m--m-21,/.MQ=~~m+/%+4Vi2CQMD"i2__1oAQM=CD=4,ᓽV5/§+©+4=4.Rmi=2,m2=0(ª«)
•
m=2i2CQMDxi2(3)ᵫ⚪QqS©2-1■¬V2)¥B(4,0)ஹD(0,2)

20•••BQ2=(W-4)2+(g©2_|±_2),11,3YDQ2=r)r+-m2——m-A(22)BD2=20জNBDQ=90஺µljBD2+DQ2=BQ2,,(1,3Y,(1,3Y20+nr+—nr——m-4-(/n-4)2+—m~—m-2ஹ22/\22).Rmi=8,m=-1,ºQi(8,18),Q(-1,0)22ঝNDBQ=90஺µ!|BD2+BQ2=DQ2,20+(¬V4>+(¬2__1mV2)-m1+^m2--1m—4^j.Rni3=3,m4=4,(ª«)ºQ3(3,-2),¿ÀᩩÁḄSQḄᙶ᪗ᨵ1ᑖÃxQi(8,18)ஹQ(-1,0)ஹQ3(3,-2).2ூSÄ௃º⚪ὃ-ÅÆnÇᦪj.᪆|ὃ-Åi2É/0102ḄnÊ,⌕ÌQ38ᑖ2j..

21