2ூ3''4ÈÉK^+y2—4y+4=0,0aJT+y—22=0,᪷WÒÓᦪḄឋ¼0ax=2,y=2,ᡠ½x-y=0.ᦑ⌱B.d·4¸⚪¹⌕ὃ»ÕÒÓᦪḄឋ¼ÒÓᦪḄឋ¼+4c,ÒÓᦪḄK+0,Ö,ᦪᙳ+0.6.LᨵØÙḄÚÛᨵÜÝᐰNḄtᳫàáâᑖã᪗å+1,2,3,4,æ᥎tᳫLᨵèéêæ᥎tᳫ,ë᥎Ḅtᳫ᪗å-K´¢5Ḅᭆ᳛"ூ$ᫀCூ'᪆ூ3'ᑡ⊤9:12341—0,2)0,3)L422—(23(2,4)333,2—3,44(41)42(43—ᵫo⊤0Éᡠᨵ´0PḄðñᨵ12òᐸᦪô-K+5Ḅõöᨵ4òU.Ptᳫ᪗å-K+5=L1237.ÈÉdP"úû+5Ḅ0ᑁdýOP=4,ᑣÿ PḄᡠᨵᑮḄᦪA.5,4,3B.10,9,8,7,6,5,4,3C.10,9,8,7,6D.12,11,10,9,8,7,6ூ%ᫀCூ(᪆ூ*( P+ᙊᑁḄ. ᡠ/0 PᨬḄ+234510,ᨬ6Ḅ+ᚖ25OPḄ:;OP_LAB,>3⚓/A20⚓
3AP=BP,ᵫ⚪DE0A=5,0P=4,ᙠRtAAOPAP=J52-42=3.♦.AB=6,ᓽ0 PḄᨬ6Ḅ6,ᡠ/0PḄᡠᨵᦪ+6ஹ7ஹ8ஹ9ஹ10.8.Iᐵ5xḄKᐗMNOPKK2%+Q+1=0ᨵSTUᨵV4ḄWᦪ᪷ᑣZᦪ=]+6Ḅ:^+ூ%ᫀBூ(᪆_*(VOP——2x++1=0ᨵSTUᨵV4ḄWᦪ᪷,4 Ἆ+1ு0,(cdkbீ0,ᓽeஹb,fe0,bVOgZᦪh=i+6Ḅ:^0Kjk^▲fe0,b0gZᦪy=m+6Ḅ:^0KMk^▲ᦑ⌱dB.>4⚓/A20⚓
49.:pᱥrynaX+bx+ca/0Ḅz{|2rx=-2,~x|ḄKT ᙠ-3,0-4,0ᐸᑖ:^:ᡠ;ᑣᑡdজ4a-b=0ঝc<0ঞc>3ad®4a-751fWᦪঠ -V--,^>-,y+pᱥrḄ ᑣN<23ூ%ᫀcூ(᪆ூᑖ᪆᪷pᱥrḄz{|ᑨজᵫpᱥr~x|Ḅ pᱥrḄz{ឋᑨঝᵫx=-1gy>0ᑨঞᵫx=-2gZᦪcᑨট᪷pᱥrḄᔣ¡z{|2r¢=-2E:^£z{|¤¥¦£§¨Zᦪ§ᜧᑨঠ.ூ*(dpᱥrḄz{|2rx=-2,.4a-b=0,ᡠ/জª«:~x|ḄKT ᙠ-3,0-4,0.•.ᵫpᱥrḄz{ឋE®KT ᙠ-1,00,0.•.pᱥr~y|Ḅ ᙠ¢|Ḅ¯°|ᓽc<0,ᦑঝª«\•ᵫঝE¢=-1g>>0,¡6=4°,ᓽa-b+c—a-4a+c=-3a+c>0,ᡠ/ঞª«ᵫZᦪ:^Efx=-2gZᦪc.'.4a-2b+c>at2+bt+c,ᓽ4a-2b>at2+btZWᦪᦑট┯µ:pᱥrḄᔣ¡z{|2rx=-2,pᱥr£z{|¤¥¦£§¨Zᦪ§ᜧ"2>ᑘ>¸ᦑঠ┯µᦑ⌱C.>5⚓/A20⚓
5ூ ¹º⚪ὃ¼½MNZᦪ~¾ᦪḄᐵ¾dz5MNZᦪ=ax2+bx+car0,MN⚗¾ᦪÂ.pᱥrḄOᔣᜧ¨.f>0gpᱥrᔣdfa<0gpᱥrᔣÃ⚗¾ᦪ6MN⚗¾ᦪᐳÅÂ.z{|ḄÆÇdf~6ÅÈgᓽ>0,z{|ᙠy|ef~bÊÈgᓽM<0,z{|ᙠy|Ì.Íᦪ⚗cÂ.pᱥr~| dpᱥr~y|50,c;pᱥr~x| TᦪᵫÏÂ.dÏ=-4ac>0gpᱥr~x|ᨵ2T Ï=᮱-4࠷=0gpᱥr~x|ᨵ1T Ï=-4ac<0gpᱥr~x|Uᨵ .10.:kÓÔ4BCD!"6ḄªOÔ Eᙠ4B$%BE=4,&'E(EF//BC,ᑖÕ80,CD5G,hS .I”,NᑖÕ+OG,CEḄ ᑣḄA.3B.2GC.V13D.4ூ%ᫀCூ(᪆ூᑖ᪆ÚÛÜÝkÓÔ8CEE+ÞÔ᪷ªOÔḄឋßcNBCD=45E4DFG+4Ὺ2âjâÔ᪷4ῪjâÔ“jrᔠK”ḄឋßcAMBF+2âjâÔ᪷2âjâÔåÓrḄឋßᑭᵨèé.ᳮᓽëìMNḄ.ூ*(:ÚÛ5íᵨ0,dABCD+ªOÔEF//BC,•••kÓÔ8CFE+ÞÔdN+CEḄ BFஹCE+ÞÔBCFEḄzârM8,N,hj ᙠÅKᩩ2r.V8+ªOÔ/BCDḄzârNBDC=45°...Ï/hG+4Ὺ2âjâÔ.ïd+ADEGḄr.♦.ðhñ+GÓḄò>6⚓/A20⚓
6MAA/8R+2âjâÔ,dNBFḄ MN=-BF=-yjBC2+CF2=-x>/62+42=).222ᦑ⌱C.ூ ¹º⚪ὃ¼½ªOÔḄឋßஹÞÔḄឋßஹ4ῪjâÔḄឋß2âjâÔåÓrḄឋß4ῪjâÔ⚔âḄâ¥ᑖrஹõÓḄòõÓḄr“jrᔠK”2âjâÔåÓr45åÓḄK°ö÷øùVᐵឋß+(⚪ᐵú.Mஹûü⚪(þ⚪5ᑖᐳ30ᑖ)11.ᙠᦪᑁᑖa4-25=ூᫀ(Y+5)(a+)(a-য.ூ᪆ூᑖ᪆!"#ᑭᵨ&'()*+ᑖ,-./0ᫀ.1=(/+5),2_5)=(/+5)1+56_6).89:⚪<⌕ὃ?ḄAᑭᵨ&'()*+ᑖ,BCDẠ⚪F.:⚪◤⌕HIḄJAK☢⌕M5NᓄP(QR,ᯠKTᑭᵨ&'()*+ᑖ.12.V,*+AB//CD,Zl=115°,N2=65°,ᑣNC]C^.4Bc.Dூᫀ50ூ᪆ூᑖ᪆`aᑭᵨ&+bḄឋdefgfḄឋdᑖ᪆/0ᫀ.ூVAB/7CD,21=115,o7⚓/q20⚓
7r.NFGD=N1=115,.,.ZC+Z2=ZFGD=115°, 22=65°,r.NC=115°-65°=50°.ᦑᫀP50.ூ89t⚪<⌕ὃ?u&+bḄឋdஹefgḄf,wx/0NFGD=N1=115A⚪ᐵz.13.V,8DஹEஹFᑖ{|C4ABCḄe}~,DEBC,EFAB,ADDB=32,BFFC=.ூᫀ3:2ூ᪆jnAp3CFCF2BF3ூ/"DEBC,ᡠ2——=——=],PEF/8,ᡠJ=J=,ᡠ——=,DBEC2EABF3FC2ᦑᫀP:3:2.14.V,ᙠᡧgOAB,ZAOB=WO°,OA=18,MᡧgOAB8BḄ`bᢚ,8OាᙠB~Ḅ8Dᜐ,ᢚOAC8C,ᑣDḄP.ூᫀ4ூ᪆ூᑖ᪆V,aOD,o8⚓/q20⚓
8D᪷ᢚḄឋd,OB=DB,XVOD=OB, OD=OB=DB,ᓽAODBA]}efg.AZDOB=60°.VZAOB=100°,/.ZAOD=ZAOB-ZDOB=40°.40•448**•DḄP=4%.18015.V,8AḄᙶ᪗P¤-4,0 ,`by=V^x+n¥ᙶ᪗¦C8BCaAC,NACD=90,ூ᪆ூ`b¥ᙶ᪗¦C88,C,8Ḅᙶ᪗P¤@,0 ,C8Ḅᙶ᪗P¤0,"©,38Ḅᙶ᪗P¤-4,0 ,ª48=90,«AB-=AC2+BC2,,/AC2=AO2+OC2,BC2=OB2+OC2AB2=AO2+OC2+OB2+OC2o9⚓/q20⚓
9ᓽ¤¬+42=42+2+_“©2+”2,33/L—¯,=0(°±).3ᦑᫀP²3k16.V,³}gOABCA&+³}g,}OCᙠx¦Ḅ´¦~,µ¶·y=-(k<0)ḄV¸X8A¥BCḄ8F,aAFஹOF,¹ºAOFḄ☢»P9,ᑣkḄ¼Pூᫀ-12ூ᪆ூᑖ᪆✌ᐜ᪷&+³}gḄឋd/0ºFCOḄ☢»,ᯠK᪷µ¶·¿ᦪVÀ~8Ḅឋd/0NCOC=13,-./0ACFNḄ☢»ZXFOCḄ☢»=13,Á0ºFNOḄ☢»,᪷kḄÂÃIÄ/0ᫀ.•••ºAOFḄ☢»P9,³}gOABCA&+³}g,.♦.ºBOCḄ☢»P9,kFABCḄ8,.♦.ºFCOḄ☢»P4.5,Å8AḄᙶ᪗P(a,-),8AÆAMLx¦a¥8M,8BÆBP_Lx¦¥8P,8FÆFNJ_x¦¥8N,ᑣºAOMÇZ\BCP,kII\\kk ••8BḄÈᙶ᪗P,OM=PC=,• ¥ÊBCḄ8, CN=|H,FN=-X-=——a22a2a•.•8Fᙠµ¶·¿ᦪVÀ~,/x=2a,ᓽON=|2Ë,x2a11j3.OC=\2a\--\a\=-\a\,ANCOC=13,,ºCFNḄ☢»ºFOCḄ☢»=13,̺FCOḄ☢»P4.5,.♦.ºFONḄ☢»P6,ᑣk=-12.o10⚓/q20⚓
1089:⚪ὃ?u&+³}gḄឋdஹµ¶·¿ᦪVÀ~8Ḅᙶ᪗ᱯÎϵ¶·¿ᦪkḄÑÃIÄ,xÒ4CFNḄ☢»ºFOCḄ☢»=13A⚪Ḅᐵz.eஹ⚪(ᐳ8⚪,17ஹ18ஹ19×⚪8ᑖ,20ஹ21ஹ22×⚪10ᑖ,23⚪12ᑖ,24⚪14ᑖ,ᐳ80ᑖ)17.(1)ØÙ(-r)ஹ"+(1-ট)°-tan45°(2)'Ý(x+1)2=3(x+1)ூᫀ(1)T(2)xi=-1,X=22ூ᪆ூᑖ᪆(1)ஹ✌ᐜ᪷á#âஹ´ᢣᦪ#äஹ«#᪷åef¿ᦪḄØÙæᑣ/0ᔜḄ¼,ᯠK*+ÁåØÙr(2)ஹᑭᵨᑖæÁ0'ÝḄ.(1)1=-3+2+1-1=-1.(2)(x+1)2-3(x+1)=0,(x+1)(x-2)=0,/.x+l=0,x-2=0,/xi=-l,X2=2.89:⚪<⌕ὃ?ḄAᦪḄØÙæᑣÏᐗ«#'ÝḄæ,BCDẠ⚪F.êxØÙæᑣᓽë/0ᫀ.18.ᙠíîᵪðñò~,᪷óôᵱö÷øùúḄðñᕒḄᡂý(ᓫ|m),ᑴḄজঝ᪷ᐵᑡ⚪图11⚓/20⚓
11$II&'Ḅ()*+ᡂ-ᦪḄ/ᙳᦪஹ2ᦪ34ᦪ5$6&᪷()*+ᡂ-ᵫ8ᑮ:;<9>?ᐭA+BCᑏ*+ᡂ-E1.65mḄJKᕒMᔲ?ᐭA+.ூᫀ$1&25;$2&()*+ᡂ-ᦪḄ/ᙳᦪS1.6L52ᦪS1.65534ᦪS1.605$3&*+ᡂ-E1.65mḄJKᕒM?ᐭA+.ூ᪆ூWX⚪ᑖ᪆$1&ஹᵨ\1]^ᐸ`ᡠᓰḄcᑖdᓽf'aḄh5$2&ஹ᪷/ᙳᦪஹ2ᦪ34ᦪḄ34ᦪS10ஹ11ᦪḄ/ᙳᦪ•• ᪷34ᦪfᑨnMᔲ?ᐭ95V1.65m>1.60m,M?ᐭA+ὃ$1&ஹ2ᦪ5$2&ஹᡧw5$3&ஹᩩw5$4&ஹᩗ/ᙳᦪ5$5&ஹ34ᦪ19.ᡠᓫᙠ/Ḅᙢ☢¡¢ᜮ¤Aᜐ¦ᙶ¨¤Bᜐᙠ/kᙢ☢Ḅª/«¡A,8Ḅ®¯°E49cm,{²oNC,8c¦Z8Ḅᜳ·ᑖjE45°¦68°,¹Cᑮᙢ☢Ḅ®¯E28c»ᙶ¨3¼Eᜐ¦BḄ®¯5EE4cm,'Eᑮᙢ☢Ḅ®¯$¾¿Àᶇ4ᦪ&.$Âὃᦪ:sin68°»0.93,cos68°®0.37,cot68°®0.40&ூᫀ66.7cmூ᪆ூᑖ᪆ËCÌCH_LABH,ËEÌEFᚖBABÑÒ«F,ÓCH=x,ᑣAH=CH=x,BH=CHcot68°=0.4x,ᵫAB=49Õx+0.4x=49,'oCHḄÒ×ᵫEF=BEsin68o=3.72᪷12⚓/20⚓
12Eᑮᙢ☢Ḅ®¯ECH+CD+EFfoᫀ.ூWËCÌCHLABH,ËEÌEFᚖBABÑÒ«F,ÓCH=x,ᑣAH=CH=x,BH=CHcot68°=0.4x,ᵫAB=49ox+0.4x=49,o:x=35,VBE=4,.••EF=BEsin68°=3.72,ᑣEᑮᙢ☢Ḅ®¯ECH+CD+EF=35+28+3.72~66.7(cm),Eᑮᙢ☢Ḅ®¯°E66.7cm.ூØÙ⚪ὃÚB·Û·wḄÜ▭Þᵨ᪀⌼B·Û·wᑭᵨâÕ·ãḄÛ·äᦪhS⚪Ḅᐵå.m20.âÕB«y=4-x¦ædçäᦪy=—(m>0,x>0)ḄèéA,BêAxḄëᙶ᪗E1,¦x¼y¼ᑖjéC,D.(1)'îéBḄᙶ᪗5m(2)ᑭᵨäᦪè'ᐵxḄïᨵðñ4-x<Ḅò5X(3)'Û·wAOBḄ☢ó.ூᫀ(1)(3,1)(2)03(3)413⚓/20⚓
13ூ᪆ூWᑖ᪆(1)ஹ᪷⚪loAḄᙶ᪗ᯠöoædçäᦪḄ᪆ñ᪷éḄ'÷oBḄᙶ᪗5(2)ஹ᪷äᦪḄéøùoäᦪḄᜧᐵú5(3)ஹᑭᵨADOCḄ☢ó]^AAODḄ☢ó]^ûBCOḄ☢óoᫀ.W(1)ᵫ⚪lA(1,3),A(1,3)ᙠü=ý¡X'ÿ4-xr=if-3xxᡠm=3,ᵫ43ᑮᡈ....Bᙶ᪗(3,1)(2)ᵫᨵ4-x<@Ḅ03.(3)ᵫ⚪D(0,4),C(4,0)•••SAOB=SADOC-SAAOD_SABCO=_~X4X4--^-x4xl--^-x4xl=4.A⚪⌕ὃ"Ḅ#$ᦪ&'()$ᦪḄ*+ᜧ-(.Ḅ/0123456Ḅ⚪7.ὶ9/:;<=*ᙶ᪗#⚪Ḅᐵ?.21.1ᙠBCABCD41EDABEF1GAE=-AB,EF1EC,HIBF.3(1)14(2)VAB=3/3'AE=—AB,.,.AE=V^ஹBE=2t1VAAEF^ABCE,A3uἠ=ἠ'ᓽᗟ={1AF=21ᑣBFWAF2+AB2=62+(M)2=}.DvDC0~Y0⚪⌕ὃ"Ḅ#BCḄឋ^+abCcdḄᑨk&ឋ^123456Ḅ⚪7.᪷\ᚖ=ZAFE=NBEC#⚪Ḅᐵ?.22.1PB&cᑗ3B,B0PḄᚖMBA,ᚖC,*O3A,HPA,AO,A0ḄOM*03E,&PBḄOM*3D.(1)15PA=PB,: