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2AEBDA.ABI/DEB.AC=DFC.ZA=ZD^90°D.AC//FD2ஹlm⚪(p⚪4ᑖ ᐳ24ᑖ)13.᪷x(x-l)(x+l)=X2-1,(x-l)(x2+X+1)=x3-1,(^v-l)(x3+X1+X+1)=x4-1,(-l)(x4+x3+x2+x+l)=x5-l,-Ḅ JK22018+22017+220,6+…+2?+2+1Ḅᦪ!.14.ᑖ x=,.15.ᓫcᕒḄஹஹ3\☢ὃ᪶(ὃ᪶Ḅ£ᑖᙳ8100ᑖ)3\☢Ḅ¥⌕ឋ¨©ª«83:5:2,®¯°ὃ᪶ᡠḄᑖᦪª«890ஹ88ஹ83ᑖ VW®Ḅᨬ^ᑖ!ᑖ.16.² 1ᑖᙠ³ᦪµᑁᨵ¶· ᑣxḄ¸µ!.17.6 9¹FA3CD»&:ACᢚ½ ᑮ6ᡠ¿Ḅ6F +3ḄÀ+ B',B'CÂADÃ+£.AB=2,BC=4,ᑣ4EḄ¹!.18.ÅN V4-|-5|+(2019-^)°=3ஹ È⚪(ᐳ78ᑖ)19.(8ᑖ)ÉÊ⚜ÌÍᧇᨵÏÐÑ⌶ ᵨ1600ᐗÕ,ᢇÍᧇ ☢Ê^×ᯠÙÀÚ Ûᵨ6000ᐗÕÜᢇÍᧇ -2ᢇÍᧇḄᦪÝ!-,ᢇḄ3Þ ßᓫà©-,ᢇá2ᐗ.প-,ᢇÍᧇãᓫàäåᐗæ(2)2«ÕÍᧇᢥD,àè├ê Bᢇᐰìêí^ îᑭå1200ᐗ VW├êᓫà=å8äåᐗæ20.(8ᑖ)4ᨴ23ñ!òóôõñ öõ÷ø “ôõJKúûüᢝþÿ
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4জ!"ADEg/kBOFঝ$%"S^DEF+S^CEF=S^ABC. 2&'()2, NEDFᑮOE*AC+ᚖ- .Eᙠ/AC01ᑨ3SAPEF+SACEF*SAABCḄᐵ5678!. 3 :;<3, Eᙠ/ACḄ0 = >⚪2Ḅ@ABᔲᡂEFGᡂE,I78!JG+ᡂESADEFS&CEF,SA.BCKᨵM᪵Ḅᐵ5FᑏPQḄ$%+◤!23. 10ᑖᙠSABCAB=AC,DB-BC0T+*BஹCVᔠXADYTᙠADḄᨵZSADE,[AD=AE,ZDAE=ZBAC,\]CE. 11, Dᙠ/BC0^NBAC=90_!]NBCE=_______aJ 2b/d=&,4BCE=.জ2, ᙠ/BC0ghᑣa,klᨵM᪵Ḅᦪnᐵ5FIo!ᳮᵫJঝ ᙠ-BC0ghᑣa,klᨵM᪵Ḅᦪnᐵ5FI-]ᑏPQḄ@A.24.(10ᑖ)stu"svᑡtuxx+2y=0(1)<.3x+4y=6y733(2)<,xy1------——173225.(12ᑖ)AB//DC,AB=DC,AC*80zO.
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6K OᑮØḄÝÞzᓽØÆØÙḄàzᑭᵨØÙḄ☢ãä ØÆØÙḄ☢ãk'ᓽYåæk'.ூçss"ᵫ⚪è OYAABCḄᑁÜᑣOᑮØḄÝÞzbÝÞYr,ᑣSAABO=_AB,r,SABCO=_BC,r,SACAO=_AC,r,222SAABO:SABCO:SACAO=—AB,r—BC,r—AC,r222=ABBCAC=203040=234,ᦑ⌱"C.ூêë⚪ὃìØÙḄÙÀᑖḄឋîஹØÙḄᑁÜஹØÙḄ☢ãäᐵïBð ØÙḄØᩩÙÀᑖzTñTBØÙḄᑁÜ.2ஹAூᑖ᪆᪷ó'Ḅឋîôõ¤ö{sᓽ÷.ூçsV(2-x):x=l:3/.x=3(2—x)x=6-3x3søx--2ᦑ⌱"A.ூêë⚪ὃìù'úḄឋîûü“ᑁ⚗kã⚗kã”Bs=⚪Ḅᐵï.3ஹBூᑖ᪆᪷óᑖtuḄÿ ᑖᨵḄᑖᑨᓽᫀ.ூ Aஹ ᑖᓄ"#Ḅ$%&'"#ᑖḄᦑ)⌱⚗┯-.8ஹᑖ/ᑖ/%&ᨵ01ᦪᦑ)⌱⚗34.Cஹ᪷6ᑖ78ᐹᜓ;#ᩩ= জᑖᨵ01ᦪ.ঝ'@ᦑ)⌱⚗┯-;ஹᑖ$%&ᨵᦑ)⌱⚗┯-.
7ᦑ⌱:B.ூDEF⚪ὃIJᑖḄ&Kᑨ%#'ᔲᑖM⌕'O6ᑖḄ&KPQ'Rᑖ/'ᔲᨵ01ᦪ(TU VV'$78'⊤X01ᦪḄ).4,Aூ᪆;[\◀^3,x>-y,;[\_y, x+y>0,ᦑ⌱A.5ஹBூᑖ᪆`abcdḄ&K f%#cdg%ᩩhiᢚkhi;lḄmᑖnopqrᔠ"#cd`abcd.ூ ᪷6`abcdḄ&Ktᨵ“ᗐ”xᔠᩩ=ᦑ⌱B.ூDE)⚪ὃI`abcdḄ&K)⚪yz{Ạ}ᵨ⚪t◤`abcdḄ&Kᓽᡂ.6ஹDூᑖ᪆cdᯠᑭᵨ“HL”Rt^ABGRtZ^DEHᐰ@᪷6ᐰ@da}q@NB=NDEH,ᑖNE'┦;.ூcAABC^DADEF/AB=DE,BC=EF,AG>DHᑖ'ABC^DEFᙠRtAABGRtZ^DEH/AB=DEAG^DH'.,.RtAABG^RtADEH(HL),/.ZB=ZDEH,.,.NE'┦|JNB=NDEF,NE'¡JNB+NDEF=NDEH+NDEF=18O°,ᦑ";#dḄ¢[ᡠaḄḄᐵ¥' p⊡ᡈq@.
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9L⚪⌕ὃtᙶ᪗%Ḅᓄ-y⚪ḄᐵO¡¢£ᙶ᪗Ḅy¤¥'I¦§¨©ᙶ᪗Ḅy¤¥'I¦ª¨.10ஹAூᑖ᪆᪷X~,Ḅᐵ}mcḄ☢«h☢«¬®h¯°cuy±Ḅ².ூ+´ᡂḄῪ·%ªI▢¹Ḅ☢«s=a2-b2,ªῪ·%Ḅ☢«s=2(a+b)(a-b)+2=(a+b)(a-b),☢«¬ᡠ/ᡂºa2T?=(a+b)(a-b).»y±².ᦑ⌱IA.bbaaூJKL⚪ὃtuy±²Ḅ¼½¾¿vL⚪ḄᐵOcḄ☢«h☢«¬®h¯°cuy±Ḅ².11ஹcூ᪆ᑖ᪆I᪷Xᐰ|%ḄᑨÁឋÃcAABCAAEDᐰRhcZB=ZE,ᑭᵨÆ,%Ḅᑁ|ᓽm.+I•.•|%ACD'|%/.AC=AD,ZACD=ZADC=ZCAD=60°,VAB=DE,BC=AE,AAABC^ADEA,.,.ZB=ZE=115°,ZACB=ZEAD,ZBAC=ZADE,/.ZACB+ZBAC=ZBAC+ZDAE=180°-115O=65°,.,.ZBAE=ZBAC+ZDAE+ZCAD=650+60°=125°,ᦑ⌱C.
10JKID⚪ὃtᐰ|%ḄᑨÁឋÃᐵO᪷Xᐰ|%ḄᑨÁឋÃcABCAAEDᐰ.12>Dூᑖ᪆᪷X⚪)mÇ,¬ᡠ/A⌕ÈÉᐰÊ◤ÈÉY,̬ᡈÈÉ,Ḅᜳ|¬ᡈÈÉ ,Ḅ|90°ᑭᵨHLÁᳮÈÉᐰᓽm.ூ+I•.•BE=CE,,BC=EF,112239—1Ḅîᦪï7.ᦑᫀ'I7.ூJKL⚪ὃtḄÆ⚗.Õ¬ᐵḄ¤¥¡¢ðñcã䤥⚪ḄᐵO.14ஹx(x-l)ூᑖ᪆òײóXRSóᑖ.ூ+X2-x=x(x-l).ᦑᫀIX(x-l).ூJKὃtuò²óÕᑖóôõ¡¢óᑖḄÕL⚪ḄᐵO.15ஹ87.1ூᑖ᪆ö☢ὃ᪶øᡠḄᑖᦪᑖQ.ùúḄᩗü謦ᓽmᑮᨬøᑖ.352ூ+þÿḄᨬᑖ=90X6+88ᐗ+83X=27+44+11.1=87.1(ᑖ)ᦑᫀ87.1.ூ⚪⌕ὃ ᩗ ᙳᦪᦪ!Ḅᩗ"#$ᦪ!Ḅ&'“)⌕*+”⌕-./0ᦪ!1◤⌕345ᜧḄ“ᩗ”ᩗḄ78'9:;<=>?Ḅ@A.16ஹx>lூᑖ᪆>?ᑭᵨHI᪷KḄᨵMḄᩩOᑮᐵRxḄSTKUSTKᓽWᫀ.ூXUᵫ⚪MWx-l>0,Ux>Lᦑᫀx>l.ூ⚪ὃHI᪷KᨵMḄᩩOZ[\]HI᪷KḄ^_`ᦪabcᦪaU⚪Ḅᐵd.ூXU•••fghABCDaih.\AB=CD=2,AD=BC=4,ADBC,/.ZEAC=ZACB,
12 •,ᢚlAZACE=ZACB, • ZEAC=ZACE,AAE=CE,ᙠRt^DECnCE?=DE?+CD?,oAE=x,/. 4-x2+22=x2,16-8x+x2+4=f5x=p,2ᦑᫀp.2ூ⚪ὃqᢚrᣚihḄឋuḄvᵨ wxḄឋuḄvᵨTῪz{hḄᑨ}ḄvᵨU~ᮣvᵨᢚlḄឋuUaᐵd.18ஹ-1ூᑖ᪆>?ᑭᵨ `᪷ḄMஹ'ᢣᦪḄឋuᑖᓄ.ᫀ.ூXUK=1-5+1=-3+1=-1.ᦑᫀ-1ூ⚪⌕ὃᦪvᓄᔜᦪaU⚪ᐵd.zஹU⚪ᐳ78ᑖ19ஹ 1pᢇᧇᓫ8ᐗ. 2├ᓫ¡¢11ᐗ.ூU᪆ 1opᢇᧇᓫxᐗ᪷!T£ᐵ¤HᢇᧇḄᦪ£apᢇḄ3¥ᑡ`*wUᓽW§<2o├ᓫ?ᐗ᪷!ªᢇᐰ¬®ᑭS¢R1200ᐗᑡSTKwUᓽW.ூXU 1opᢇᧇᓫxᐗ¯!J3ஹ3±=xx+2Ux=8³´µx=8aᑖK`*ḄUpᢇᧇᓫ8ᐗ.
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