HUONG DAN QUAN L isa DUNG sir mmi niimui''''mns siimvuviu} vAo itAi TOAIV Tbi uiA Till tm iviiilT, iiiA Till mi6 \IIAT CAA HAM H6 UAC ILII Trong chuong trinh Dai sd 10, hgc sinh (HS) c6 djp lam quen vdi[.]
Trang 1HUONG DAN QUAN L i s a DUNG
sir mmi niimui'mns siimvuviu} vAo itAi TOAIV
Tbi uiA Till tm iviiilT, iiiA Till mi6 \IIAT CAA HAM H6 UAC ILII
Trong chuong trinh Dai
sd 10, hgc sinh (HS) c6 djp
lam quen vdi ham so bdc
nhat vd hdm sd bdc hai
Dac bipt Id hdm sd bgc hai
y=f(x)=ax~+bx+c (a?K)), ling
dyng ciia chung vdo edc bdi
toan tim gid tri Idn nhat, gia tri
nhd nhdt (GTLN, GTNN) thgt
phong phii Trong bdi bdo ndy,
tdi xin trinh bdy mpt ling dyng
ciia Geometer's Sketchpad
(GSP) vdo vipe tim GTLN,
GTNN ciia hdm sd bac hai
tren mpt doan cho trude
Bai todn: Tim GTLN^
GTNN eiia ham sd
y^f(x)^ax \-bx+c, (a^O) tren
doan [m;n]
Cach giai
Ta lap Bdng bien thien
(BBT) cho hdm sd y=J[x) tren
doan [m;n]
Cach gidi nay_ khdng phdi
HS ndo ciing de ddng hieu
dugc, vi cdc em mdi lam quen
vdi Bdng bien thien, md chi
xet tren (-x; +00) mgt cdch
hinh thirc (?!) Do do, tdi da su
dung Geometer's Sketchpad
de giiip cdc em nhin nhdn vdn
de mgt each trye quan nhdt
Vi dy Tim gia tri Idn nhat_,
gid tri nhd nhdt cua hdm sd
y=f(x)=x^-2x-4 tren doan
[-2;5]
Mudn gidi dugc bai
todn ndy tren phdn mim
Geometer's Sketchpad (phien
bdn GSP5 hogc GSP4, gido
vien cd the tim tren mang,
hogc ed the tai vl theo dia
chi sau http://wTvw.mediafire
cm/?ed41khaj5m8qkwm, lira
Phan Van Phirong
Truang THPT B Hdi Hgu, Nam Dinh
y day la phan mem thuong
mai, neu khdng mua thi chi dung cho myc dich gido dye), Chiing ta can phdi ldm lan lugt cac budc sau:
Budc 1 Tgo mgt bdn ve (sketch) mdi bang each chgn File-> New Sketch (hogc bam to hgp phim tdt Ctri + N)
Budc 2 Chgn Graph->
Show Gird de nhin thdy hp tryc tpa dp
Budc 3 Ve do thj hdm
sd y=J{x)=x'-3x-4 bang each
chgn Graph-^FIot New Function hoac an to hgp phim tat Ctrl+G Sau dd nhap
vao xf'l-lx-A An OK
De dl chuyen dd thi den vj tri thich hgp cd the nhdn vd giii chudt trai vdo gdc tga do rdi di chuyen den vi tri mdi
Budc4 Chgn cdng cy Point Tool (hinh dau cham) Xem hinh I
- Bdm chpn hai diem -2 vd 5 viia tgo tren true Ox, dn Chi +
K de hipn ten cho 2 diem nay, mgc dinh Id A, B (Khi mpt ddi tugng dugc chgn, chiirig se hi bao phii bdi dudng vien mdu hdng)
- Chgn Contruct->Segmeiit
de tao doan thang AB (hoac dn Chi + L)
Budc 5 Chgn cdng cu Point Tool Bam vdo mpt vi tri bat ki tren dogn AB de tap diem C (dn Ctri + K de hipn ten cho diem mdi tgo ndy) Chgn cdng cu Translation Arrow Tool Bam chgn diem
C (neu diem C da dugc chpn
san thi thdi) vd tryc Ox hoac
doan AB
Chgn ontruct->Peipaidkuhr
de dung dudng thdng y di qua
C vd vudng gdc vdi AB Bam chgn giao diem ciia
dudng thang j vd Parabol
k
0
1 1 1
I
1
1
: ' ,
\ • '
ni?ii, I
- Bam vao diem -2 va 5 tren Bam Ctrl + K se hien ten diSm true Ox si tjo hai dijm co tga nay la D (Xem hmh 2)
dp A (-2;0) va B (5;0) (B6 tao dilm D co th6 chon
-ChpncongcvTranslation duong thingj va Parabol rbi
Arrow Tool (hinh mui ten), jn Ctrl + Shift+ 1)
hoac an ESC Chpn didm D va duong
Ngay nhan bai 19/6/2012 Ngay duy^l ding 27/7/2012
3 8 TAP CHI THlflBIGUO DUC-SO 84-8/2012
Trang 2HUONG DAN QUAN LI SI/DUNG
l\
' \ '
A \
I
1
1
<\
1 ,
• / I
-'ci
1
1
rr ••
-'
ID
i- i
thang j hogc tryc Oy Chgn
ontruct->Perpendicular de
dung dudng thang k di qua D
vd vudng gdc vdiy
Bam vdo gigo diem cua
k yd trye Oy de tao diem E,
(bdm Chi +K de hien ten eua
diem ndy)
Budc 6 Bam chudt phdi
vao diem E, chgn Trace
Intersection
, Chpn dudng, thang j vd k
Bam Ctrl + H de dn hai dudng
thang da chgn
Chgn diem E, D Bdm Ctri + L
Chgn dilm D, C Bdm Ctri + L
Chgn 3 doan thdng AB,
CD vd DE Chgn menu Display->Line Styie->Thin
Chon menu Display->Line
S t y l e ^ D a s h e d Chon tat cd cdc diem A,B,C,D,E Bdm Ctrl + K d l
an ten cdc diem tren
_ Budc 7 Bam chudt phdi vdo diem C, chgn Animate Point
Khi dd hop dieu, khien Motion Controller xuat hien
Cd the chgn Speed (tdc do khodng 0.50) de dilm E tao vet khi chuyen ddng dugc ro hem
Liic ndy ta thay khi dilm
C di chuyen hong pham vi tir -2 din 5 thi diem D di ehuyen tren Parabol vd cd tung dg thay ddi trong phgm vi tir -5 den 11 Tuong ling vdi GTLN
ciia hdm so y^J{x)=x^-2x-4 la
II vd GTNN Id-5
Cd the xem tun^ dg diem
D thay_ ddi nhu the ndo bdng cdch bdm chudt phdi vao diem
D, chgn Ordinate (y) (De cira sd nhin rdng hon,
cd the chon Display->Hide Text Palette)
Tdi ti^u tham khao Phan trg giiip (Help) ciia phan mem Geometer's Sketchpad 5 Sumary This article guides the Geometer's Sketchpad you use to illustrate finding the maximum value, minimum value of quadratic functions
y=f(x)=ax^+bx+c, (a?^) m
the showed range By showing students see the value of the fiinction changes when the number of variations on a given segment defined
PHUONG P H A P S U D U N G ATLAT DIA LI.,
luge dd vdi bdn do de khai
thdc kiln thiie
+ Sir dyng cau hdi yeu cau
HS phdn tich Idt cdt dia hinh,
hogc dya vdo bdn dd, ve vd
phan tich lat cat dia hinh
(Cac cdeh ldm tren cd the
thuc hien vdi m^t, hoac nhieu
hang bdn dd ciia Atlat)
Tai liSu t h a m k h a o
1 Atiat Dia li Viet Nam, NXB Giao due, 2010
2 Nguyen Dire Vu, Phdn
tich bdng so li^u, ve bieu do, lucre do, dpc Atlat Dia li Vipt Nam, NXB Dgi hpc Qudc gia
Hd Ndi, 2011
S u m m m a r y Geographic Atlas of Vietnam is an important means
of teaching, which is used
(Tiep trang 5)
heavily on student leaming and test, test The process
of using Vietnam Geographic Atlas often steps: setting up the outline (outline) knowledge extraction and exploitation
of maps content; presented
as written assignments The exploitation of Atlas content under different owners have different specific outline
TAP CHI THIFTBI GIAO DUC-SO 84-8/2012 • 3 9