Nguy0n;
2) Ddo Dtlc Chinh,l2Tr, THP| He NQi - Amsterdam'
TP. Hi NOi;
3) L€ Dury Todn, 11A11, THPT Luong Dic Bing' Hoing H6a, Thanh H6a;
4) PhanXunn Mirrl?, 11A1, THPT Di6n ChAu 5, Ngh0 An'
Hinh 2
BN I
Phdn chio rynQt do gi6crrr80 rudne Eflsc rrr80 rudne Eflsc
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Hinh I
TrOn hinh 1 ndu vE 6
dudng ch6o cira mqt
luc gi6c l6i ABCDEF
thi phdn chia duocmi6n luc gi6c d6 thdnh mi6n luc gi6c d6 thdnh
f+ ,iiin"da gi6c rdi A
nhau (khong kd bion). Ndu b6 hai dudng ch6o BE, CF vd v6 hai duong ch6o AE, BF thi chi
duo. c 13 mi6n da gi6c rdi nhau. Dhnh cho ban doc
1) Hay vE 10 dudng ch6o cira mOt da giSc ddu
24 canh dd phan chia miiin da gi6c d6 thinh
53 mitin da gi6c rdi nhau'
2) Chfng minh rang ndu vE 10 dudng ch6o cfia
.ot Au !ia" tOl 24 canh thi kh6ng thd phen
"tia mie"n da gi6c d6 thinh nhidu hon 56 midn
da gi6c rdi nhau.
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ciai dap bai:
Ihier di$n cua hinh lil$ phuumu
(Dd ildns fiAn THTT sd 355 thd'ng 1'2007)'
1) . T?i dinh D ctra hinh l?P Phuong
ABCD.A'B'C'D'rr€iu vE m4t phing (P) song song
(hoac trirng) v6i mat phing (ACD') ta duoc
thidt diqn EFG ld tam gi6c ddu (h' 2) do 5p
dung dinh li ThalEs: PHI PHI
Hinh 3
Hinh 4
50 YWffiW
u lac a-a bOI I I I N I I I I I I I
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Ddng 1. Ngiy LQp h+ ndm nay.
Ddng 2.Thdng md THTT ra ddng thdi hai td
tidng ViOt vh tidng Anh.
Ddng -1. Cudc thi sE c6 trong hd.
Ddng 4.DC cta cudc thi trong hd niy s6...
Ddng 5. Ldn ddu tiOn hd ndy THTT s6 c6 m6t sd...
Ddng 6. Noi ddt mua THTT
Ddng 7. Yira chi m6t th6ng, l,tla c6 nghla lh
thdi gian n6i chung.
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Ban hdy tim m6t cdt doc vi
giAi th(ch f nghia cira n6.
Qui tang cria CLB sE dinh
cho cdc ban giii dring vi gui
vd s6rn (theo ddu buu dien).
vU o0 queN
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sfi"#!W 56 35e ts-zoo7l 5lndy tt6 bon'ft ch8: ndy tt6 bon'ft ch8:
xuir nitt rtJ Dot
sd 35e(5.2007)
Tda so1n : 1878, Pnd Gidng V6, He Nfi
DT Bi6n tdP: 04.51 21 607, 04.51 21 606
DT - Fax Phdt hdnh, Tr! st1: 04-5144272
Email : toanhoctt@Yahoo'com 7W a/,i 10i?1, *Q0,ta fllrt'\ Rt
AAnt rAru *ril'l/urth ttldYgt'n
not o6Nc nrutt rAP
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rS. rnAN oilg CuAU, t S. NCUr6-N ANH OOyC, tS .mAN^t.rtAM DONG, tS' NOWnN MINH DUC'
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Di0n tlhn day - hoc to6n - Math Teaching Forum
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IHIU rnAcn wnryru xuir aAu
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Ph6 Tdng Gi6m tldc ki6m
Tdng bi6n taP NTXB Gi6o duc
NCUYBN Qrrituao
To6n hoc vi ttdi sdng - Math and Life
TYi.n Nam Dune - Binto6n vd v6 hanh phfc'
Di ra ki nhy - Problems in This Issue
T1/359, ..., Tl2l 359, L1l359, Lzl 359.
Giai bei ki trudc - Solutions to PreviousProblems Problems
Giii c6c bdi cria sd aSS.
BAN C6 ViN Xnoe rugc
GS. TSKH. NGUYEN C.{NH TOAN
GS. TSKII. TNAN VAN NHUNG
TS. NGUYENVANVQNG
GS. DOAN aUiNH
PGS. TS. mANvnx rl4o
Dirnh cho Trung hgc
Secondary Schools
LA Bd Hod,ng - Tt idi c{c tri hinh hgc.
o "";;1*Tottlrff3;]u' 'rP Hd chi Minh
tai ViQt Nam.
Chudn bi thi vio tlai hgc - UniversitvEntrance PreParation Entrance PreParation
Trinh Tud.n - Van dulg m6t sd tinh chdt don di6u cta hdm sd dd giii to6n,
Thir sfc trudc ki thi - Dd s6'4.
@ ciai bii chio IMo 2oo7 - Do-t 3
JEI xdt oui ki thi chon hoc sinh gi6i Qudc
v gi, m'6n To6n THPT ndm hoc 2006-2007 '
To6n hgc mu6n miu Multifarious
Mathematics
@ Ca" lac bQ - Math Ctub
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Anh dudi: Trong hQi thi Tidng h6t hqc sinh'
TRONG SO NNY
Co s6 - For Lower giAi mQt bdi to6,n
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rnnr rRoruG offi rnrtu s0 sAcn offio KHoA Trlt Hoc rudl
,i. Ouydn 1, 2 ua 3 dinh cho cic ltip 3, 4, 5, cip Tidu hoc:
cuNG Hgc TrN HOC
Hoy hgc Tin hgc dd vuo hoc vuq choi voi moy linh
o Ddy la bO sAch Ttn hoc ducyc bien soon theo chuong trinh m6i nhdt do 86 Gi6o duc vd Ddo too bon hdnh, Ngodi ro, s6ch cdn
gi6i thi6u nhidu phdn mdm tr6 choi hdp ddn gi0p cdc em vlo
choivrio hoc m6tcdch hi6u qu6.
o 86 sdch ducy. c thidt kd theo phong c6ch hien doi kdt hqp v6i nhi6u tronh dnh minh hgo hdp d6n,
o N6i dung duoc trinh bdy phr) hopvoi l0o tudi hoc sinh Tidu hgc.
IP. Hd NOi, l87B Giting V6, Hd NOi.
IP. Hd thf Minh, 231 Nguy6n Von (ri, Q.5, TP. HtM.
IP. Dd Ndng, 15 Nguydn Chf Thonh, IP.0d Ndng.
,f Ouyin 1,2,}vi 4 dinh cho c6c ldp 6, 7,8,9c6p Trung hoc cds&
TIN HQC OAUX CHO TRUNG HOC CO S6
oDdy la ba sach Tin hoc duo. c bi6n soon theo chuong trinh m6i nhdtdo 86 Gi6o duc vd Ddo roo bon hdnh, la ba sach gi6o khoo chlnh thdng
ddu ti6n ddnh cho hio tudi hoc sinh THCS.
o 86 s6ch duoc thi6t kd theo phong c6ch hi6n doi kdt hqp v6i nhidu tronh 6nh minh hoo hdpd6n.
o N6i dung duo. c trinh bay phU hop voi lro tudi hoc sinh THCS, trong bi cho c6c em c6ng c,,, dd hgc tdtc6c m6n hoc kh6c.
DrA cHi uir ui:
(l(c Eot{ vl TAp mf olr iluA sicn THr0 ElA ffil: