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1©ª«¬ḄiSIḄᜧᐵ®(()A.>SiB.SjsM,ᦑ⌱IA.ூRW᪷;ὃ[i8⚪Ḅᐵ(º^i²ᜧᦪ;Ḅ³´²ᜧMi²ᦪ;Ḅ³´².4.ᐗ$%i¼/4%5=0½¾¿iÀGÁu,()A.0-2)2=1B.(x+2f=-lC.(x-2)2=9D.(X+2)2=9ூ4ᫀCூ8᪆ூᑖ᪆ᐜÂ⚗ஹᯠÀᑭᵨÆᐰiÈ'¿iᓽG.ூH88I%2-4X-5=0x2-4x=5x2-4x+4=5+4(x-2)2=9.ᦑ⌱IC.ூRW⚪ὃ[\Éᵨ¿iÊ8ᐗ$%i¼ᮣÌÉᵨÆᐰiÈ'¡¿i(84⚪Ḅᐵ.5.ᵬcÍÎÏÐÑÒÐÓfᙠÕᕜḄ×qØᑁcÍÎÏᜩÒ%ḄdᦪᳮᡂᵬஹcÜᦪ;"⊤IᐵÞßᦪ;"ᑡàÊáâḄ(()ÎÏ/ããã$ãtããäᵬ2043213404A.ᵬஹḄåᦪæÐB.ᵬஹḄçèᦪæÐC.ᵬḄᙳᦪᜧḄᙳᦪD.
2ᵬḄiḄiூ4ᫀDூ8᪆ூᑖ᪆ᑖꩪëᵬஹcÜᦪ;ḄᙳᦪஹåᦪஹçèᦪìiAíî8Gm.ூH8A.ᵬḄåᦪ(2ஹḄåᦪ(4,ᦑåᦪPæÐA⌱⚗┯ðIB.ᵬḄçèᦪ(2ஹḄçèᦪ3,ᦑçèᦪPæÐB⌱⚗┯ðMC.ᵬḄᙳᦪ=2.2,Ḅᙳᦪ=2.4,ᡠÞᵬḄᙳᦪḄᙳᦪC⌱⚗┯ðMD.ᵬḄi=0.792,Ḅi=1.488,ᵬḄiḄiáâD⌱⚗áâMᦑ⌱D.ூRW⚪X⌕ὃ[i8⚪Ḅᐵ(ᙳᦪஹåᦪஹçèᦪìiḄDE.6.ò¡vuABCçcsôõRO,ABLAC,AD=5cm,OC=2cm,ᑣsô8Ḅw,()cmூ4ᫀDூ8᪆ூᑖ᪆ᑭᵨ¡vuḄឋ=~Dᳮ᧕îḄwNGîëḄw.ூH88I•.■043CDḄsôAC÷8DæõR0BO=DO>AO=OC=2cm,BC=AD=5cm»-.AB±AC,.ZBAO=90°,AB=4BC2-AC2=A/52-42=3(cm)ᙠçᵫ~DᳮmIBO=>JAB2+AO2=V32+22=V13(cw),:.BD=2BO=2-JV3{ctn),ᦑ⌱ID.ூRW⚪ὃ[\¡vuḄឋ=Þì~DᳮḄÉᵨ8⚪Ḅᐵ(º¡vuḄឋ=.7.ùúûªüý~ûᨵÿ⚪ᐸᨵḼḄᩈᙠᩈᨵ
3ᩈᩈᚖᚮᙠᙢ☢Ḅᑖ!ᨵ3"ᱫḼ⌨%ᙠ&ᩈ᪷8"ᜐ)ᵨ+,-ᨵ./012/34x"᪷5⚪6ᑡ894()A.82+x2=(x-3ᫀCூA᪆ூᑖ᪆2/4x"᪷5CDEᳮᑡG89A>ᓽ6.ூJAA2/4X"6ᑡ894(X-3)2+82=X2,ᦑ⌱C.ூMNO⚪ὃQRCDEᳮḄSᵨTUVWᐵYZᑡGᐗ\]89A⚪Ḅᐵ^.8.ABCD_,AEᚖabᑖBCcE,AE=lcm,ᑣBCḄ/()A.1cmB.2G,emC.3cmD.4cm3ூ>ᫀBூA᪆ூJAAfg4AEᚖabᑖBCcE,ᡠiAB=BC=2BE,ZAEB=90°,ᡠiAE=bBE,ᑣBE=@,3ᡠiBC=j39,1kᦪCl,b,cmn+b+c=O,ᑣ()A.b1-4tzc>0B.b1—4ac<0C.b2-4ac>0D.
4b2-4acᫀCூA᪆ூᑖ᪆᪷5a+h+c=O,6wb=—a—c,z{ᐭ4ac6w=~a—c1NO,ᓽ6A.ூJAA•••a+/?+c=0h=-a—c,/.b1-4ac=~44c-cr+2+2-4QC=/—lac+c2=~4i-c2>0ᦑ⌱CூMNO⚪⌕ὃQRᐰb8ḄSᵨᐰb8A⚪Ḅᐵ^.10.f.ᙠA8C_NAC8=60AC=1,A8Ḅ_ME8CM,1DEbᑖA8CḄᕜ/ᑣOEḄ/4~A.1B.—C.ᙠD.-223ூ>ᫀBூA᪆ூᑖ᪆/BC¡M,£CM=CA,¤¥AM,¦C7VLAMcN,᪷5⚪wᑮME=EB,᪷5«¬_®¯EᳮwᑮAM,᪷5VῪ«¬Ḅឋ²GNACN,᪷5³30¬a¬«¬Ḅឋ²´CDEᳮGAN,µ¶ᓽ6.ூJAA/BC¡M,£CM=C4,¤¥AM,¦CN_LAMcM•••QEbᑖABCḄᕜ/:.ME=EB,AD=DB,.DE=^AM,DE//AM,VZACB=60°,
5/.ZACM=120°.ZACN=60°,AN=MN, NC4N=30°,: CN=*C=W, "RIP¹•»AM—,9BD=DA,BE=EM,2ᦑ⌱8.ºஹஹ--------------D-----------BூMNO⚪⌕ὃQḄ«¬_®¯EᳮஹVῪ«¬Ḅឋ²ஹ³30¬Ḅa¬«¬Ḅឋ²«¬_®¯EᳮஹYZ¦G¼½¯A⚪Ḅᐵ^.ஹ⚪(ᐳ4⚪⚪5ᑖᑖ20ᑖ)11.ᐵcxḄᐗ\]89/+1_=0Ḅ¾᪷2,ᑣ¿¾᪷.ூ>ᫀ-3ூA᪆ூᑖ᪆ᵫ⚪6Ám2{ᐭᐗ\]89Â%AḄÃᯠzÂ%A89Ḅ¿¾᪷.ூJAAᵫ⚪Ák2{ᐭᐗ\]89/+j=0w22+2-4/=().Awa=6,...Å894f+x-6=0A89w᳝=2,=3,\89Ḅ¿¾᪷4-3Èᦑ>ᫀ4-3.
6ூMNO⚪⌕ὃQᐗ\]89ḄAÉᐸAÊᐗ\]89ḄAÉᐸAÊA⚪Ḅᐵ^.12.1¾.Ḅ¬´ᑁ¬´Ḅg,ᑣξ.Ḅᦪ.ூ>ᫀ8ூA᪆ூᑖ᪆᪷5.Ḅᑁ¬´Ḅ(n-2)X180´.Ḅ¬´A89ᓽ6GnḄÃூJAA2ξ.Ḅᦪ4ᑣ᪷5.ᑁ¬´Ñ¬´6w89360°=Ó-2)xl80°3Aw=8ᦑ>ᫀ48.ூMNO⚪ὃQḄ.Ḅᑁ¬´ᑭᵨᑁ¬´Â%ᑡ89A×O⚪Ḅᐵ^.13.fᙠ4BC_NBAC=90AOBCḄÙEஹFᑖÛABஹACḄ_M1AB=8,AC=6,ᑣDEFḄᕜ/4.ூ>ᫀ12ூA᪆ூᑖ᪆ᐜ᪷5a¬«¬ÝḄ_¯VcÝḄÞ6wDE^-AB=4,DF^-AC^3,z᪷5CDEᳮ6wBC=10,ᯠ᪷5«¬Ḅ_22®¯Eᳮ6wEF=5,ᨬ᪷5«¬Ḅᕜ/ᓽ6w.ூJAA•.•AD6cḄÙ.ZADB=ZADC=90°•• E,<ᑖÛAB,ACḄ_M,áAB=8,AC=6,:.DE=^AB^4,DF=^AC=3,•••ᙠA/WC_NBAC=9()o,AB=8,AC=6,.BC=4AB1+AC1=10'
7äåEF1ᑖÛAB,ACḄ_M:.EF=LBC=5,2ᑣ.DEFḄᕜ/4DE+DF+EF=4+3+5=12,ᦑ>ᫀ412.ூMNO⚪ὃQRa¬«¬ÝḄ_¯VcÝḄÞஹCDEᳮஹ«¬Ḅ_®¯EᳮVæçMa¬«¬ÝḄ_¯VcÝḄÞ´«¬Ḅ_®¯EᳮA⚪ᐵ^.14.fèæéABCAB-S,AD=4,ECD,CE=5,MPMBGêiëì1¾ᓫ®/3Ḅî3ïḼ54ᔣñMAòó¤¥PE,2MPòóḄ)ô4ì,õöᑡ-⚪.~2 ÷=)"4EiPE4ῪḄVῪ«¬.23ூ>ᫀজ.5ঝ.ᡈ/=26ூA᪆ூᑖ᪆~1 ᪷5CDEᳮa¥Aᓽ6wᑮ>ᫀÈ2 iPE4ῪḄVῪ«¬ᨵûüýþPE=AP^OPE=AE,÷PE=4P᪷5AP=8-t,PF=5-t,ᑭᵨCDEᳮÿ f,PE=AE,ERᓽBP,ᑮfḄ.ூ1 E0=CD-CE=3,AD=4,AE2=ED1+AD2=25AE=5,ᦑᫀ52 PEῪḄῪ!PE=AP"$%ᡠ'()*+■48,ᚖ.F,
8EF//AD,.ZEAD=ZAEF•• 01ABC3/.AB//CD.ZDEA=ZFAEZDEA^ZFAE.