I 1A l Trunng chrly6n KHTN, DHQC Har Ngị
AB FA AO-FO d-
D6 chiLng minh A,B, : @f
Tu (1), (2) vir (3) suy ra
tl _ | _.t,_
-Lt -
d d-.f d-.f
2) Anh dich chuy€n c[ng chi€u vói vAt nOn d. = dt -10, dz = di+20 (5)
Ạ B.
lheo bar ra r I 2. suy t'u
AtBt ctz *2di (6) tlz cl r Tir (5) vi (6) ta c6 d, +20 2tli =20(dt + d,) = 11,17; (1) dt -10 clt dong dang, n6n (t)
Chia ca hai v5 cLra (7) choZOctptl, ter duo-c
ltll
-+- d; d =--- 20.1:-, do c15.1 =20cm. D
(Nni,n x6t. Circ ban sau diy cti loi girii clirn-o vir gon:Tlrrii Nguy0nt Vi QLrtrrtg Minlt. lll,ị -t't',irt Vit:r Hin,c.. Tlrrii Nguy0nt Vi QLrtrrtg Minlt. lll,ị -t't',irt Vit:r Hin,c..
l0Tor'rn. THPT chuyOn Th/ri Nguy6n: IIii Nam: Dinlr
Ngr.tc Ht)i, lOLị THPT chr,ryOn Hr'r Nanl l{ung YGn:
Ngallrr Th! Mi ['lting. 1lTN7, Tl-lPT Virn Ciang; Nam
Dinh: L2 Quung Trung, I2t-i, THPT chuy€n L6 Hong Phong; 'l'h6i llinh: N,qrnot VLur Sttn. lr)Lị THPT Bic
D6ng QLran, Phtut Clti Mui, l2Toitn, THPT chuyOn
Thdi Binh; Thanh H6a: N,qrn,it Minh HiiLL. 12A3,
THPT HAr-r Ldc l, Mai Vdn Titttg, Ngr.r'/n Von Monh, l2Al, THPT H1u l-Qc 1, Tritit Vcirt Tutn. l0T. THPT chLryen Lam Sonl NghC An: Trtrotrg L0 \/in. A3K38, Ngr.1,dr Trung Hung, A3K37, THPT Phan B6i Chiu,
Ho Vart Dtirtg, I IAl, THPT Hoirng Maị Dtirtg HirLt
Trotrg. I lAl. THPT Qu! Hirp 2; Binh Dinb: Phqnt
Gia Htt'. 10A1, THPT s0 I An Nhón; Cin'lhó: L0
Dui Thinh. l2A 1, Ngin'1rt Long Phtr|t Drr)rg, I lA,3,
THPT chuy6n Ly Tu Trong; Quring Ng7,ti: Phorn Quot:
D(t. llBl. Br)l Dtíc Khtinh. 12Li, Vo Vtirt CLittg.
l0AỊ THPT chLry6n ị0 Khitit; B6n lre: LiAu Khoc
Viị 10Lị THPT chuy6n B6n Trẹ
NCUYE).J VAN THUAN
(2) (3)
(4)
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sAcH mdr TUyfru GHmr THEo cHUyEN of mrudru Bl clro rd TH rdr rucnrB, rnpr UA THIUAt} DflI HM, CAtl OAIUG MoN ItlAIU
Tfp I: Dai s6, Lrt'{ng gi6c, Gi6i tich
260 trang, khd U x 24 cm. Gi6 bia : 36.500 along
lip 2: Hinh hoc, Td trop - X6c su6t, 56 phric 240 trang, khd 17 x24 cm. Gi6 bia : 34.500 rt6ng
[dc bun cti th6 muo cdc dn phdm tren loi Tdo soon, ctic
cosd Buu di6n, cdr (6ng ly Sdch-Thi6t bi trrdng hoc ti
cdc dio phuong, ctic crio hdng sdrh crio NXBGD Vi0l Nom.
(dc don vi muo nhidu xin grii phi6u dot muo sdch (rd ki t6n dring d(iu) ve ldo soon theo dio chi :
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