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DAn ti ti 4,481it.dkrc h5n hqp X vdo binh chua dung dich nucvcBrz du, sau khi phdn ring xdy ra hodn todn th6y ktrOi tuqng binh tang th€m 7,0 gam.. Tim cdng thric cAutaoco thd co criatrmg[r]

(1)so GrAoPUcvA DAOTAo K\r' THI CHgt\; ;re^CrslNqCrOr CAp TiNn LOp |THCS KHOANGAYIS-3_2017 BINH EJNH Dd chfnh thric T6 T6n bii Dfr IiQura ^ .-, , Lap So ho hans (5 ,Jiin"t I \41t{4 s6ra,vtaW A T TIN HOC phrir_ (kh6ng ke thoi gianphat d?)) $li S11"' 15,0 Nga-vthi: lB/3/2017 rh Bni M6n thi: - SOLAMA.PAS Ban phim STR.PAS STR.INP TAMGIAC.PAS I A M G I A C I N P Ddy so rdngr:,7AiUr am grac lcrn nhAt 6,0 diAm) Mdn hinh STR.OUT TAMCIAC.OUT .h€hq hringntiu chungc6 t6ne ciic Lrdcs6 90 vd 147 ld.haiso coquunt ho hdng 2.3, 51r5ngbangI 0), sd I4j co cacuoc T\ui sd t.unhidna vd b (1< a 1010) N€u c6quan h€thikdm th6ng b6o u*d jf.*ifi;Hif:rlXlllf l;] *u'* Vi du L' ldJ:ap ha: s : 90 j-17 Hai so 90, L47 co quan Tong cac uoc nguyen to L^ tre la^ rrv - 10 f a }a ^ trqlty / Vf du 2: Nhap hai so can kiem tra: Aa A r ^ J _ V4 + rZ H a i s o , k h o n g c o quan he ho hang Bii2: 56 La MA (j,0 rJi1i:mt tln! nhagvaos6rr,rnhi6nN (0 < N < 4000)ru banphfm.vi<itra * Y:ltlt-f:e manhinh so N duoi dan_e VIdu: t L no blet: s6 La Md NhapN:25 rhi in mdnhinhld XXV NhApN: 98 thi in mdnhinhle XCVil l\ihapN:2017 thi in mdnhinh Id MMXVII Chfrs6 La M5 Gid tri I V X 10 L 50 C D M 0 500 I 000 (2) so crAo pVc t A DAo rAo BiNH DINII Ed chfnh rhri,c KYrHr crroNHgg.sryI.cr6r cApriNn Lop()rHcs K H O A N G A Y1 8_ - N46ntiri: NGtf VAN Thoi gian: 150phrit (i<h6ng ke thoi gianphiit d61 Nigdl'thi: 78/3/2077 Cdu (8,0 di€tn) Doc c6uchuy.n sauvdrth\rchidn circyeucdu b6n du6i: A sg bi6t crn toi,, ryi* dinh di boi Ngudi bi mi€t thi tilc ndy bay i bqn dd tim cdch ctru anh Khi dd ten bd, im ngtrdi bqn t6t nhtit cila t6i dd cru sdng Ngtdi hdi; "Tai tdi xuc pham anh, anh vi€t t€n cdt, cdn bay gid anh lqi khdcl€n dd"? Anh ta trd diiu vi€t lan cdt sd mau ch6ng x6a nhda theo thdi gian, ,"N!*.8 nhr'rngkh6ng co!di,: th€ xoa daqc nhirng diiu tiit dgp dd daqJshi tac tr€n dd, ldng ngadi" vQymdi chilng ta hdy hoc cdch viil nhrrngndi dau buin, thit hqn lan cdt vd khiic ghi nhitng dn nghTalLn dd" (Hgt gi6ng fim hin, tdp4, NXB Tdng hqp TP.HCM,2004) a Hdy.n6u hai bdi hgc rut ru c6u chuydndo b' vitlt mQt bdi van nghiJuan (\hoing- 400chfi) trinh bay suy nghi cria em vd cdu: "Hdy hpc cdch vi€t nhfing n6i dau buin, thit han lan cdt vd khhc gni ilrrrng 6n nghTal€n dd" Ciu2 (12,0die@ Trong bai "Ti€ng noi cria vdn nghO"- sachNgfr vdn g, tap hai - Nguy$n Einh Thi tuong ndu minh, y€n lgng Vd cdi y\n hng phdn tich bdi tho "Anh tdng,,cria Nguy6n (3) so crAopUCvA oAo rao BINH DINH DOchinh thri.c Ky rHr cnoN rrocsrNH Gror cAp riFur r_o.iq rHCS xnoAxcAy rs_s_zorz Mdn thi: SINH HQC Thoi gian: 150 phrit (kh6ng li€ thoi gian phdr de.t Ngay thi: 18/312017 Cdu (3,0di€d a' Khi huydt dp cho m6t b€nh nhdn,c6n b6 y t6 ghi 120/80 mmHg Cho bi6t y nghia c6c s6 tr6n.Chringimg vdi pha ndo tr.ongchu ki tim? "h,rng b NOL'nirfing nguy0n nhdn chrl y6u ldm thay ddi huy6t 6p co th6 Cku2 (2,5dienl., a' Tai saotdc d0 dAntruy€n xung thAnkinh cung phdn xa sinh du&ng ch6m hon cung phan xa vdn ddng? 6ch da mo ae nghidn cuu rE tiry, m6t hoc sinh -dd,v6 - yJ dung mffi !\vv keo rqrtr ldm uL , , |'JtcnmQt d,r m6t sO16.Bangc6chndo d6 ph6t hi6n rd ,rdo 16 nao iatz' "orr, Ciu (2,5dienl.' a' Ph6ntt ADN c6 chric nang gi? Phdntri ADN tu nhAnd6i theo nhirng nguy6n tfc ndo? b Su tu nhan d6i cta phdn tu ADN c6 y nghia gi d6i vdi sinh v4t? c) Neu c6c ddcdi0m gi6ng gifra anN thO"'gtin (mARN) vd ARN v6n chuy6n (tARN) CAu4 (2,sdie@.' c6 b6 nhiSmsacthOtrongt6 bdosinhduenqlir 44A* X, nguoi ndy bi hQichrmggi? n.r hi6n ,YQ,,iq"yt Bi6u ki6uhinhnhu th6ndo?NOuco ctc ph6tsinhcuah6i chimgd6 F Ciu (3,0di€m).' a' Ndu c\c dlc di6m co bdn cta quAnxd sinh vdt Khi ndo quAnxd sinh v6t c6 su cdn bing sinh hqc? b Trong m6t quAnxd sinh vdt,.co mdt qudnthc th6 dang sinh s6ng binh thudng Ncu xuAt hi6n mdt lodi dQ.ne.vaf co mdi quAnxd sinh vAt trdn thi sExdy hiQniuqn g gi? Gi;ithich .an c ThCndLo ld su dung ho.p ly tdi nguy6nthiOnnhi6n?ViQctrdng cdy hq d-aulu6n phidn vcri c6c vu tr6ng iria ndm c6 ld bi6n pnap r" Jlr"g hcr-p ly ngu6n tai nguye; i6i;;i1o'gz Tai sao? Cfiu (3,0d1em) M6t te bdo sinh duc so khai cua gd c6 bQnhi6m sic th€ 2n : 78 NST, m6i nhi6m sic th6 dcrn cin Xff khec r.rh1g,khi gigm phdn khdng co trao doi doan te bao ndy nguyen ph6n dcrr ll:tg.lhp li€n tiOpd vr)ng sinh san r6i l6n l6n v6 kich thu6c, sau d6 trdi quaving chin giam phin ACtao ru c6c tinh trung binh thudrng.Tinh theo ly thuy6t: a vrlnp sinh sin s6 nhi6m sacin6, dcrnmoi tucrngducrngdo m6i trucrngn6i bdo cung cep cho ,., I l6n nguy6nphdnthri ld bao nhiOu? b' Xirc dinh s6 nhiSm sac th€ mdi tuong clucmgdo mdi truong n6i bdo cung c6pcho cA hai qu6 trinh nguy€nphdn vd giAm phAntrdn c SOiucrngtinh trung ducrctao lir baonhi6u? CiuT (3,5di€m) d mOl lodi thuc vdt, cho giao philnhai cdythuAn chung thAn cao, hoa vdng voi th6n lDn, hoa thu duoc th0 he Fr 100%thAncao,hta Cho F1tu thu phAi thu duoc o pz e6,i + f"ai 6a" fri'f.ro ti lC 56,25%thtn cao,hoa do: 78,750 thdn cao,hoavdng: 18,7syothdnlun, hoa eO:6,25%0 thdn lun hoa vdng.Bi0t m6i cap gen qui dinh tinh trang a Bi€n iuAnvd lAp so d6 lai tu P d6n F2 b' Trong s6 cdy thAn cao, hoa d F2 thi ti l€ cdythdn cao, hoa khdng thudn chirng ld bao nhi6u? c Trinh bay n6i dung qui 1u6tphdn li dQc16pcuaMenden (4) SO GIAOD[rg 124DAO TAO BINH DINH Dd chfnh thric KY THI CIION HOCSINII GTOTCAP TINH LOP THCS KIIOA NGAY 18_3 _2(177 M6n thi: DIA Li Thoi gian: 150 phrit (kliongke ftcri gian phat c1d) Ngar,tlii: 181312077 CAu (4,0di€nt) Giai thfch tai saothoi gian mila xuAnva mia h4 o'B6c ban cAu ddi l-ronmDaxu6n rrd mua o Narn bdn cdu? b Su'giArnnhiet khong ldti theo vi d6 dia li vd theo dO cao tren Trai D6t co su khac nhaunhu th6 nao?Tai saosu chdnh16chnhi€t dd gita vung u gar-u; if.f, ]u" irr"g ,"r, fru nh6 hon muad6ns? Cfiu (4,0 di€tn) Dua vdo At-lat Dia li Vi0t Nam (Nhd xutit bdn Gido ctac Vi€t Nam) va circki6n thric dd hoc,hdy: GiAithich tai saorndcdir o gAnXich dao,,nhung nhi6t dd trung binh v6 mua cta Narn o - n ^ , i i ' I thaphon ndn nhi6t d6 vdo mua o Bac Trung 86, Ddng bing Bac B6 vd Nam Tay f Bac? X Giai thich t4i saoo'mi6nBic vd D6ng BEtcBhc 86, trongmua d6ng vfln co nhtng ngdy nhi6t d6 kh6 cao,n6ng nhu mua ha? Cdu (4,0diem) Dua vdo At-lat Dia li Vi6t Nam (Nhd xuiit ban Gido dtlc Vi€t Nam) vd citcki6n thuc d6 hoc,hdy: 24'Giai thich tai saoniia kh6 cria khu vuc Bac B0 bcrtsdusfc hon so voi khu vuc Narn 86 vd Tdy Nguy0n? b Cho bi6t vdo rnua d6ng, h4u vung ddi nui thAp khu vuc Tdy B6c vd D6ng Bic o nudc tal<hdcnhaunhu th6 ndo?Tai sao? Cdu G,0 died a Dua vdo At-lifiEia li Vi6t Narn (l{hd xuat ban Gido duc ViQtl{am) vir citcki6n thric dd ttty gi6i thich tai cdc d6 thi o vung Duy6n h6i Nam Trung 86 thuong tAp trung ven lg:, bi0n b Dua vd:obdng s6.li6udu6i d6y vd cacki6n thuc ddhoc,hdy nhdn xet vit gihithich.,reco : , ; , , cau,su chuy€ndich co cAudAnso phdntheothdnhthi vd n6ng th6n o nu6c ta roxc so bANvA so nAx rnaNH rHI cua NuO'Crrcur o<l4Ntssl- z0rz t)on v Nshin nnrdi Nh m r990 Tdng s6 dfin 650161 7995 l g q ss Sd d6n thinh thi l2 880,3 14938,1 2000 2005 2010 2012 71 630,9 82 392,1 69 , 88 772,9 87 , )))Tn ? 5q 28 356,4 - r J r ) v - v J L J ) t Ngu6n: Ni€n gtcim th6ng ka vi€t Nant 2012, Arhdxttir bdn ThiSngke, 201j, trang 63 CAu (4,0di€nil Dua vdo At-l6t Dia li ViQt Nam (Nha xtdt bdn Gido duc Viet Nant) vd, citcki6n rhuc dd hoc ,h i y a Trinh bdy sp phan hoa ldnh th6 cong nghiOpning lucrngcria nuoc ta Phdntich ngu;,dn nhdncriasp phdnhoa d6 b Chobi€ttai saoc6cho4t dQngdich vu o nuoc ta phAnbd lchongd6u? c Cho bftt tai viOcx6y dung cdcnhdmdy th0y di6n o'\,ung Tay Nguy€n lai giAm duoc nhi€uchi phi? (5) so crAo pr.rcvA EAorAo BIM{ DI]\H D€ chfnh thri'c Mdn thi: HOA HQC Tiroi gian: 150 phrit (kir6ngk6 thci eian pirdt d6; Ngdl'thi: 18/312077 C6u (2,0di€m) Dung dich X c6 chria chdt tan nhAtl.dmQtmu6i Y cria kim loai natri Cho dung dich BaCl2 ol vdo6ngnghi€mdr-mg dung aicrrx +i;;i kd;.;;; ffi;'e; Nh6ti€ptir tu dungdich 9,': "r.iri HCI vdo6ngnghiQm trdnthiy co r""ihr;ih;'lu xu" dinhc6ngthric ciramu6i y vd vi6t cric phucmgtrinh h6a hoc xdy Cdu (2,0 died Ti6nhanh3 rhi nghiem: - Thi nghiOm1: cho N_avd b6t Ar2o3(ri lQ moi 1: 1) vdo nu6c du - Thi nghiQm2: Cho h5n hqp chriaFe3Oa vd Cu (ti 16mol l: 1) vdo dung dich HCI du - Thi nghidm 3: cho b6t zn vdo dung dich Fecl3 (ti lQmol zn : Fec\ : l: 2) Saukhi phdn rmg xhy rahodn todn,c6 bao nhi6u thi nghidm thu duqc chdt rin? Gi6i thich Cdu (2,0 di€nr) dar.91t khong cho ddn phdn img xiry rahodn todn, sau d6 cho roan , \"ng 16ns llong b6 san phdm vdo dung dich HzSoa lodng ,!-u.d"gc dung dich X Cho dung dich X t6c dung ht f" dungdich Ba(OH)2du khOngkhi Am "d,i Viet t6t ch cacphuongtrinh h6air oc xay Ciu (2,0die@ Cho m gam kim loai M vdo dung dich H2Soa lodng du thu duoc 6,721it H2 (dktc) vd dung dich chira(6m + 1,8) gam mu6i Tim kim loai M CAu5 (2,0died Khu hodn todn4,64 gam m6t oxit kim loai bing CO du o nhigt d6 cao, thu duoc kim loai M DAn toan b0 sinh vdo binh dpg dung dich Ca(OH)2,thu duoc gamk6ttuavd dung dich X, dun di:l l4i thu thdm duoc gamkct tua nfia Mdt ldtac,l6y lugng kim lo4i ,irrh'ru hod tan 3gne.du1e I h6t vdo dung dich HCI du, thu duoc 1,344litkhf H2 (dktc) Tim c6ngthric cir-aoxit kim loai / e CAu6 (2,0die@ FeQ.,lO3)2 vd AlzO: vdo dung dich HzSOalodns du r NaOH viro dung dich y thu duoc t9,26 gai ket I Chon cdc chAtkhric ,4.1,A2, , A.5thich hgp dChodn thdnh c6c phuong trinh h6a hoc sau (glri rd di€u ki6n xhy raph6n img, n€u c6): (t) pE -f!L-+ C2HsCl (5) >44 -f9-+ A, CH3COONa (t) >A, -l?I-+ Az il>a, > Ciu 12,0diemt chAt,h-iru co X mach ho duoc cdu taotu hai nguy6n tO.C va H, d6 C chi6m gg,235(yo - ,TT vd l'hdi lucrng'Mdt kh6c, hidro h6a hodn todn X thu duoc hqp chAtY Clo h6a y (theoti 1€mol 'I : t), thu duoc ddnxuitmonoclo id d6ng phAn cua Tim cai cdngthuc c6u tao ,O t6e-J il; C6u (2,0diem) H6n hqp X g6m hai hidrocacbonmach ho DAn ti ti 4,481it.(dkrc) h5n hqp X vdo binh chua dung dich nucvcBrz du, sau phdn ring xdy hodn todn th6y ktrOi tuqng binh tang th€m 7,0 gam Lugn8 tho6t dem d6t chayhodn todn thu duoc 3,36 lit cb2 lotctc;u{ +,05 gam H2o Tim cdng thric cAutaoco thd co criatrmg hidrocacbontrons X H6n hqp X gdm m6t ankin M vd H2-coti 16mol tucrngun12: Nung nolg 0,75 mol hdn hqp X mdt thoi gian vdi xuc ttrcNi thu duoc h6n hqp Y co ti kh6i so voi H2 Aing Z1,Sl5 DAn h6n hqp Y qua dung dich brom du, saukhi phan img xdy hodn todn, khdi luq ng brom tham giaphdnung Id 40 gam.Tim cdng thfc phdn tu cta M (6) so GrAopUc VAEAo rAo BlrvIIerJLH E6 chinh thri.c Ky rHr cHoN Hec,srNHGror cAp rixs LoT s THCS xttoA xcay rs _: _ zorz Mon thi: VAT Lf Thoi gian: 150phrit (iihonglie tho,igianphdt d€) Ngdythi: 18/3/2017 Bdi (1,0dietn) M6t chdtdi6rnchLrytin d6ng trdn dLrongthing tu'A ddng, chLry6n d6ng du.o-c gidy rhi lai "f nghi i gidy Trong3 giay d6u ti6n chdtdi6rnchuy6nd6ng vdi t6c d6 uo15 m'l s Trongc6c khodng th"cri gian ?,eiAyti6ptheochdtdiem chuydnd6ngvcri crjachdtdi6m trenqudngduongAB crictru.dngh Bdiz (4,0diAm) Hai 6ngnghidmhinh tru c6 cungti6t di6n,6 hr : 40 cm 5ngnghidm2 chu.a nu6.Jo nhi6td6 h€tnu'6'co 6ng nghidm2 vdo 6ng nghi€ml Khi c6 , caoth6m Lh= 0,2 cm so v6i lirc viLar6t xong.Tin n6ngch6ycrianu'dcdd A=3,4.r0s J/kg;nhiOtdungri€ngcta nud'c d6 c, : 2100J/kgKvd nudc c2: 4200llkgK; kh5i lu-o : ng ri6ng crianu6'cdii Dr 900 kg/mt vitnudcD2 : 1000kg/m3.nl quu ,olouola, nhietvdj mdi trudns.-of"c BAi3 f5,0 diiirn) Mdt b6ngddnc6 di6ntro Ro: e, hi6udi€nth6 dinhmri'cns: 4,5 v dugcthip srtngbing ngu6ndi€nc6 hi6LrdiQnth6 U : o'v cqi rrid, ,u6t cta mach di€n ld tj, s6 giira c6ng sudtti6u thu crja ddn vd c6ng ,uit todn mach.Mdc machdi€nnhu'hinhv6 1, didu chinhbi6n trd R d6 ddn s6ng yr u binhthudns a HiCusu6t cuc dqi cta mach di6n c6 the dat duoc ld Khi d6 phAidiOuchinhc6chmic ddn,biSntro theoc6chrhichh 7, b X6c dinh giri tri diOn tro' todn phAn tOi thi6u crla bi6n suAtciramachdi6n lch6ngnh6 hon 600/o Bdi (4,0dienl B HinhvE I nho dit vu6ng g6c voi truc chinh (A nim tr6n truc r O, v6t srlngAB quath6ukinh L cho dnh 6o A,8, 5itrad, d' vd f rruonghqp thdu kinh L ld th6u 4.2.Mil thAul<inhhoi tu L, quangtAmO, truc chinhOx, tao 6nhthet A;B;crjam6t vAtsdngA1B1vu6ngg6c v6i Ox (A1 nim trdn Ox) Di chuy6n,41trdn Ox vd A1B1song songv6i chinhn6,t6i vi tri A2B2thi thu duoc AnhA.B, nguocchiduv6i anh A,B, Trdn hinh vE chi ba diem B,, O vdrB, NOuc6ch vd vd vEhinh xricdinhvi tri cta truc chinhox vd c6ctiOudi6m crhath6ukinh L ^._8, _ O a 8,, ' Hinh vE2 Bdi (3,0 die@ Khi don ohong.thinghiOmcua trudng, m6t nh6m hoc sinh tim thdy m|y citi di6n tro'vd m6t v6n : - - , , , ) k€ cfr Khiki0mtra, thdyv6nl<6v6nhoatd6ngbinhthu'ong,nhungchi c6 tn6 ltrin Ar.q.kim cfia v6n k6 chi mdyvach md khdngbi6t duo'c gitt tri nng-vOim6i va " c6 m6t crii c6 ghi gid trj Ro= ke), c6c di6ntri rnQtngu6ndi6nkh6ngdoiphu ho.pvdi v6n k6 vd rnr crtat6tcd cacdi6ntro conlai Hoi nh6mhocsinhnd (7) so crAopVc vA oAo r4o BINII DINIT DOchinh thri'c KY THI CI{QN HOCSINII GIOI CAP TiruTTLOP g THCS xnoAxcAyrs_s_zorz Monthi: LICH SL/ Thcrigian: 150 phrit (kh6ng k6 thoi gian phat d6) Ngdythi: 7813/2017 Ciu (3,0diem) I N€u khuynh huorig chinhtri, bi u hi6n vd k6t cuc cria phong trdo y6u nu chdngPh6po Vi6t NamdAuth6ki XX CAu2(4,0di6d ,l 3, Trinhbdy doi tugng,rnucti6u,luc luc4g vd y nghiaciracuQcvan d6ng : o d 1936-1939 Tt d6,emhdyn6utinh ch6tcrtacuOcvend6ngndy C u3 ( , 5d i € m ) \ h[ i, ' -,j;1(" Cdu (3,5 di€m) , \ Hdy lam s6ngto chu truong vd bi6n phap cua DAng, Chinh phu ta OOiptrO vOi thuc ddnPh6pvd quanTudng saungdy 6-3-1946dantru6c ngiLytg-tz-lg4l C6u (3,0diem)Trinh bity t6m rEt qy6 tlnh ph6t tri6n thEnglgi cua pho.ng trdo gihi ph6ng d6n t6c o cdc nulc A, Phi vd Mi La tinh tt sau Chi6n tranh tne [iOi th; hai d6n"nam 2000 C6u (3,0di6m) Ph6tbiOuy kiiln ,re nnan dinh: Hiep h6i cdc quti gia D6ng Nam A laSeaN) doi ndm 1967nhung vi6c m6 rOngthdnhvi6n tir nu6c ban diu 16n10 nu6c lai diSn ldu dai va dAytro ngai I't ({f (8) socrAoPUC vAoAor4o KY THI CHQNHOC SINH GI6I CAP TINH LOP THCS xuoANceyrs_s_zorz BINH DINH E6 chinh thri'c M6n thi: TOAN Thoi gian: 150phft iliironglt€thoi gianphatd6) NgAl,thi' l8l3l20t7 Bili (6,0di6m) i c h o b i e r r t h u cp ;= n t + { : + - J ; - + ; - -2 m+2^lm-3 Jm-I Jm+3 a) Rtt gQnP b) Tirn gi6,tritu nhi6ncta m dCp h stl tU nhiCn chobi€uthuc: p :(a+b)(b+c)(c+a)-ahc voi a, b, c ld cdcs6 nguyon chimg minhring n6uo+ b + c chiah6t cho4 thi p chiaht5tcho Biti2 (5,0dia@ a)Chringminhr6ng:voimois6th';cx,ydu0ng,ta1u6n"o,f*1>4 x y x+y b) cho phuongtrinh: 2x2+ 3mx-,fz = (ru ld thams6).c6 hai nghidm x, vd xr J"imgi6tri nhonh6tcuabi6uthric:M = (x,- *,1, *(l* - r +;r; I x ) \ Bni Q,0 diAm) Chox, y, z ld ba s6 ducrng.Chungminh ring : ' t- x-+yz y'+xz T J-: ( r z.+xy l r \"y 1 ) yz zx) Bii Q,0 di6m) 1' Cho tam giilcgcriagc ndi titip ducmgtrdn tAmO brin kfnh R M ld m6r di6m di dQngtr6n cungnho BC cuaducrngtron d6 a) Chtmgminh: MB + MC : MA b) Gqi rI, I, K lAnluortld chanducmgvu6ng gochqtu M xu6ngAB, BC, cA Gqi E s, Dn luo't ld diOntich cua tam giitcABC, MBC Chung t"inh-;"; rcrri rtr di d6ng ta 1u6n c6 d[ng thric: n tn t + MH+lw + MK =2v3('s 2't') 3R ]\TMF AD, BE, CF ld cilc ducrngcao.L6y M h6n doan Chimg minh ring MA ld tia phdn gi6.ccua goc (9)

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