Vii Thi Thai vd dtg Tap chi KHOA HOC & CONG NGHE 84(08) 89 94 DAY HOC THEO PHUONG PHAP HOP DONG BAI ON TAP CHUONG 3 Hf HAI PHUONG TRINH BAC NHAT HAI AN (D AI SO 9) Vu Thj Thai Vu Thj Thanh Huyen* Trii[.]
Trang 1Vii Thi Thai vd dtg Tap chi KHOA HOC & CONG NGHE 84(08): 89 - 94
DAY HOC THEO PHUONG PHAP HOP DONG BAI ON TAP CHUONG 3
-Hf HAI PHUONG TRINH BAC NHAT HAI AN (D.AI SO 9)
Vu Thj Thai Vu Thj Thanh Huyen*
Triidng Dgi hgc Sir phgm - DH Thai Nguyen
TOM T A T
Lua chgn phuang phap day hgc de chuyen tai ngi dung kien thirc sao cho co hieu qua nhat la mgt
viec lam khong de Phuang phap day hgc theo hgp dong la mgt trong nhimg phuong phap day hgc
mgi theo xu huong day hgc tich cue tren the gidi hien nay No dac biet thich hgp voi nhirng dang
bai gn tap Bai bao da minh hga phuang phap da\ hgc nay bang mgt tiet On tap chuong 3- He hai
phuang trinh bac nhat hai an- Dai so 9
Ti|- khoa: phuong phdp hop ddng; hu sir dgy hue; ki hogch hdt dgy; ddnh gid cai tiin; hiin han;
chia se
GIOI THIEU
Thuc te hien nay d cac trudng phd thdng dang
sfl- dung rat nhieu phuong phap day hgc nhu
thuyet trinh dam thoai, van dap dat \an de
giai quyet van de Nhin cluing deu hudng tdi
mpt muc tieu giup hpc sinh linh bdi kien tbirc
bang each lay hpc sinh lam trung tam sao cho
phat huy tdi da nang lue sd trudng sir sang
tao cua cac em
Ddi vdi giao vien viec lira chpn hinh thirc
phuong phap day hpc phfl hop vdi mdn day
bai day, ddi tugng hgc sinh se quvet djnh sir
thaiih cdng trong cdng tac giting day cua mdi
nguiTi Giao due chi thuc sir cd hieu qua khi
cac pbuong an td chirc day hgc da dang, tao
dtrgc CO- hoi hgc tap cho nidi ngudi bgc pliii
hop vdi chiiiin muc cluing \ a nluing nhu
cau nguyen vgng vii dieu kien hgc tap cua
ca nhan
Ciin nhan manh rang, khdng cd mgt phuong
phap day hpc nao tdn tai lai khdng cd y nghia
nao dd Ve mat ban chat, ddi mdi plurong
phap day hpc la ddi mdi each tien hanh cac
phuong phiip ddi nidi cac phuong tien \a
hinh thirc trien khai pliii-ong phap tren ca so
khai thac triet de tru diem cua ciic pluiong
phap cu \a \an dung linh boat mdt so pliirong
phap mdi nham phat buy tinh tich cue, chu
ddng vii sang tao cua ngudi hpc Prong cac
phuong phap dav hpc pluiong phap day hpc
Tel: OI277'45S646 Email: huven.ni;oc'a'\-iiiail.com
theo hpp ddng ia mdt trong nluing phuang phap day hpc mdi theo xu hudng day hpc tich cue tren the gidi hien nay Nd dac biet thich hop vdi nluing tiet hpc dn tap Hpc theo hgp ddng lii nidt hinh tluic td chirc hpc tap trong dd hpc sinh lam \ iec theo mdt gdi cae
nhiem \u hoc Vap trong mgt khoang thdi gian
nhiit djnh fire hi each td chirc mdi truirng bgc tap ma trong dd bgc sinh dugc giao I hgp ddng tron g.'>i bao gdm cac nhiem vu khiic nhau; Hgc sinh dtrgc cho mdt thdi ban nhat djnh de hoan thiinli nhimg boat dgng dd (khdng nhat thiet cbi trong mdt tiet hpc); Hpc sinh chfl ddng xiic djnh ve khoang thdi gian
va thir tir tlurc bien cac nhiem vu trong hgp ddng Cac budc hgc theo hgp ddng bao gdm: lira chpn ndi dung, xay dung lipp ddng td chirc ki va thuc bien hop ddng, td chirc trao ddi/chia se (thuc bien linh boat) [2], Day dupe xem la mdt hinh thirc thay the viec giang biii cho toiin the ldp hpc cua giao vien, ddng thdi cho phep giao vien cd the quan ly vii khao sat dugc cac boat ddng cua hge sinh Vdi binh tbirc td chirc nay giao vien cd the sir dimg sir khac biet giira cac hpc sinh de tao ra CO- hdi hpc tap cho toan bd ldp hpc
frong Hd so day hpc Dai sd 9 o- tririTng THCS nui tac gia xay dung theo qui trinh tiep can xu the the gidi (quy trinh gdm ba khau: chuan bj - lap ke hoach day bgc, thuc thi ke hoach day hpc kiem tra danh gia va danh giii cai tien [5]) nhirng hinh tluic va plurong phap dav hpc mil tac tiia dii lira chon la dav hoc
Trang 2Vu Thi Thai vd dtg T;ip chi KHOA HOC & CONG NGHE 84(08): 89-94
theo phuang phap truyen thdng plui'0':ig phap
hudng din tu nghien ciru phuong phap day
hpc theo du an va pluiang phap day hpc theo
hpp dong Dudi day xin dugc chia se cung
ban dgc ndi dung ke ho-ich day hgc va
niiung danh gia cai tien biroc dau eua mdt
trong nhung tiet hgc da> theo phuong phap
hgp ddng
KE HO/iCH B A I D A Y HOP DONG
(tiet 44 Dai so 9)
Ndi dung: On tap chuong 3- He hai phuo'ng
trinh bac nhat hai an - dai so 9
Doi tugng: Hgc sinh ldp 9 dien dai tra;
Thdi gian thuc hien: 01 tiet (tiet dn tap thir
nhat);
Nhirng kien thirc hoc sinh da biet lien quan
den bai hoc
- Khai niem nghiem va each giai phuong
trinh bac nhiit hai an he phuong trinh bac
nhat hai an
Nhfl'ng kien tliiic moi can du'pc hinh thiinh
- Dieu kien de he phuong trinh bac nhat bai
an cd vd sd nghiem vd nghiem, cd mdt
nghiem duy nhat
I Muc tieu
/ Kien thiic:
- Cung cd va he thdng hoii cac kien thire
co-ban trong ebuong III - He l.ai phuang t''inh
khai niem nghiem va tap nghiem cua phuong
trinh bac nhkt hai kn he phuong trinh bac nhat bai kn; minh hoa hinh hgc cac phuong
phap giai he phuang trinh, eac budc giai bai toan bang each lap he phuong trinh
- Giai thich dugc dieu kien de he phuong trinh bac nhiit hai an cd vd sd nghiem, vd nghiem cd mdt nghiem duy nhat[l]
2 KI ndng:
- Cung CO ky nang giai pbuong trinh bac nhat
hai iin giai he pbuong trinh bac nhat hai an, giai bai toan bang each lap he phuong trinh[l]
3 Thdi dg:
- HS manh dan, tu tin, dgc lap tu giac khi lam
bai
II Phuo'ng phap, phu-o'ng tien
- Phuong phap: Day theo phuong phap hpp ddng
- Phuong tien:
+ Giao vien: Giay AO , phieu hgp ddng hpc tap cho 3 nhdm hge sinh, may tinh, projeeter
+ HS; GiayA4 trang, but da
III Ciic bu'O'c len lo'p
On dinh td chdc: 2 pluit Cdchogtddng
bae nhat hai an Trong do luu y c;ic ndi dung:
HOAT DONG 1: NGHIEN CUU KJ KET HOP DONG Thoi
gian
5 phut
Noi dung
Ki hgp dong
Hoat dong ciia thay
- Giao nhiem vu hgp dong cho tirng nhom nghien ciru;
- Pho bien ngi dung cac nhiem vu va yeu cau ciia tfl-ng nhiem vu;
- Yeu cau HS nghien ciiu hgp dgn va co tro ciing ki ket hgp dgng
Hoat dong ciia tro
- Tiing nhom nhan hgp dgng, tu nghien cuu;
- Quan sat ghi nhan ngi dung cua tung ihiein vu:
- Ki hop dong
Phuong tien, thiet
bj day hoc
Mav tinh projeeter, hgp dong in san
HOAT D O N G 2: THUC HIEN HOP DONG Thoi
gian Noi dung Hoat dong ciia thay Hoat dgng ciia tro
Phuong tien, thiet bj day hoc
15 phiit Nhu trong hgp Trg giiip HS, nhom HS gap Thuc hien cac May tinh
dong kho khan nhiem vu tror.g hgp Projeeter, giay AO,
dong da ki ket A4 but da cac
Trang 3Vu Thi Thai vd dtg Tap chi KHOA HOC & CONG NGHE 84(08): 8 9 - 9 4
HOAT DONG 3 : NGHIEM THL HOP DONG
Thoi
gian Ngi dung Hoat dgng ciia thay Hoat dong ciia tro
ISphiit I Phucmg trinh bac
nhat hai an va each
giai
2 h e phuang trinh
bac nhat hai an va
each giai (bang
phuang phap cong
dai sg phuang phap
the), so lugng nghiem
ciia he phugng trinh
bac nhat hai an
• GV to chiie nghiem thu hgp dong cua HS
Yeu cau HS trinh bay san pham
- GV chot ngi dung kien thiic bai trinh chieu ket qua
giai dap thac mac ve ngi dunsi kien thiic
HS trinh hay san pham
Ca nhan HS, cac nhom ghi ket qua ban than, nhom vii co phan hoi tich cue
Phuong tien, thiet
bi day hoc
May tinh projeeter giay AO A4 bilt da
vo ghi chep
HOAT BONG 4: CUNG GO NOl DUNG BAI HOC
Thoi
gian Ngi dung Hoat dong ciia thay Hoat dgng ciia tro
Phuong tien, thiet
hj day hoc
Sphut I Phuong trinh bac
nhat hai an va each
giai
2.He phuang trinh bac
nhat hai an va each
giai (bang phuong
phap cgng dai so
phuong phap the), so
lugng nghiem ciia he
phuong trinh bac nhat
hai an
- To chiic giao luu giua cac nhom qua tro chai " i h i giai toan nhanh":
-1 Luat chai: HS nghe ciiu hoi, dgc lap giai bai, nguoi liim xong tiuiye tien se dirge trinh bay dap an
+ To chirc chai
- Huong diin HS long hop riit kinh nghiem
- 1 hu phieu hgp dong hgc tap
HS tham gia choi
- Cac nhoir tham quan san pham cila nhom ban, chia se kinh nghiem, trinh biiy vii hoan thiinh san pham
- Cac nhom trudng hoan thiinh diinh gia viio phieu hgc tap, ki ten va giao nop san pham cho giao vien
May tinh projeeter giay ^0, A4, bilt da
HOAT DONG 5: HUONG DAN HOC O NHA
- Tiep tuc on tap hai phuong phap giiii he hai phuong trinh bac nhat hai an, cac dieu kien de he cd mgt
nghiem, vd nghiem, vd sd nghiem, Cac budc giai bai toan bang each lap he phuong trinh
- Hoan thanli cac biii tap 40 - 42, lam trudc cac bai 43-46 [3-Tr27]
- Tiet sau on tap tiep, Trang bi them may tinh bd tiii
KE HOACH OANH GIA
Tong hgp dugc cac
each giai, each xet sd
lirgng nghiem ciia he
hai phirong trinh bac
nhat hai an
Sau budi hoc
2 Kiem 45'
tra
Sir dung phieu hgp ddng hgc tiip
- Kiem tra viet trac nghieni khach quan
va IU luiin
- Ilo-in thanh dimg, dii cac cau hdi trong phieu hgc tap
- Cac nhdm phan cong cdng viec iigp ly, hieu qua, ghi chep rd tien dd thuc hien nhiem vu
- Chilt luan" bai kiem tra
Trang 4Vu Thi Thai vd dig Tap chi KHOA HOC & CONG NGHE 84(08): 89 - 94
GHI CHEP DANH GIA CAI TIEN
Sau budi hgc 9A1, - Hoan thimh ke hgach da - Mgt so hgc sinh ( 15/88 - Td chuc cho hgc
9A2 de ra em) giai he hai phuong sinh dugc tham gia 9A3 - Hgc sinh sdi ndi hao trinh biic nhat hai iin cluia nhieu ban nira hiing trong van dung thiinh thao nhung gid hgc theo phuang phap hgp ddng - Mgt vai hgc sinh chua hgp ddng
hgc tap tich cue tu giac chua san - Hudng dan diing
- Phan Idn hgc sinh da siing trong viec sii dung vien, khich le hgc kha thimh thao, linh hoat phuang phap hgc mdi sinh trong hgc tap trong viec su dung - Nhdm 3 trinh bay san bang nhieu bien phuong phap dai sd pham chua tdt phap nlur tuyen phuong phap the giai he duong, thudng hai phuong trinh bac nhat diem.,, hai an
Qua day thu nghiem Vci ket qua kiem tra cuoi P'lan I'l^p hon so vdi Idp ddi chirng dieu dd
chuong 111 cho thky: Idp thuc nghiem cd diem ehitn^i to HS ldp thuc nghiem cd diem so cao
trung binh va ti le HS kha gioi cao hon Do ^^ ^teu bon ldp ddi chirng Ket luan ban dau
phan tan (phuong sai) a ldp thue nghiem cd 'i'^) dugc the bien mgt phan qua bang sau:
10
9
8
7
6
5
4
2
Tdng sd
Hgc sinh thir Tan sd
4
12
16
24
12
10
6
1
m = 88
ngliiem Tan suat 4,54 % 13.63%
18,18 % 27,27 % 13,63%
11,36%
6,84 % 3,42 % 1,13 % 100%
Hgc sinh ddi chiing Tan sd
4
13
14
22
12
12
7
5
1
n - 9 0
Tan suat 4.44 % 14,44 % 15,56%
24,44 % 13,33 % 13,33%
7,78 % 5,56 % 1,12%
100%
S6 0
Trung binh mau ( X ): 6.83 Trung binh mau ( Y ): 6.67
Phuang sai mSu (.v"): 3.14 Phirong sai inlu( v"): 3.56
Do lech chuan (s): 1,77 Do lech chuan(s): 1,89 GlOi THIEU PHIEU HOP DONG HOC TAP
Tiet 44 On tap chuong 3- He hai phuang trinh bac nh^t hai kn - Dai sd 9
]Njf,ieni vu Biit huge Thdi gian Dia Dap Hoiin Tu danh
Tir chgn (20 phut) digin an thanh gia
TB
Y
1 a) Chi ra cac PT bac nhat hai Sn Bat budc Tai Idp G
trong cac PT sau: j^^ a) 2 x - 3 y = 3
b) Ox + 2y = 4
c) Ox + Oy = 7
d) 5x + 0y = 0
e) x + y " z =- 7
b) Dang tdng quat vii tap nghiem
ctia PT bac nhat hai an?
2 a) Dang tdng quat cua he PT bac BSt budc Tai ldp " " G
nhat hai an ? r/
Trang 5Vu fhi Thai vd dtg Tap chi KHOA HOC & CONG NGHE 84(08): 89 - 04
CflfC^ Y
I T ' '
-Neu '^ " <-'
thi he PT vd sd nghiem
a h c
+ Ngu "' ^' ^''
thi he PT vd nghiem
a h
— '^ —
+ N6u '^' ^'
thi he PT cd I nghieni duy nhat
3 Bai tap 40: (SGK./27) Bat budc Tai Idp G
Giai he PT va minh hoa ket qua K
bang hinh hqe 2x + 5y = 2 TB
-2/5X + v - I
4 B a i t a p 5 3 ( S B T - 11): i u chgn Tai lop G
Tim a, b de he sau cd nghiem la K
(3;-2) r a x + b y - 3 TB
5 Bai 42 (SGK - 27): Giai he PT Tu chgn Tai ldp G
K
TB
,/2 Y
Jl
vai m = ^
-{2 x y • I
4x m'y
Yeu cfm; Mdi nhdm phai thuc hien 4'5 nhiem vu tren gdm 3 nhiem vu bat buoc va I nhiem vu tu chgn (
cd the chgn ca hai nhiem vu lu chon cac nhdm ttr dang ki thdi gian thiic hien tirng ngi dung trong tdng thdi
gian 20 phiit)
Tdi la thay mat cho nhdm xin cam ket lioiin thiinh cac nhiem vu
trong hgp ddng hgc tap tren
Gicio vien I lgc inh
Hien nay, viec su dung p h u a n g phap hgp I k| Bd GD & DT Hudng ddn ihuc hii'n chudn
kiin thirc kT ndng mun Tudn THCS Nha xuat ban ddng trong day hge a trud-ng phd thdng mdi
chi a nuie dd thu luihicMn, chua duoc dung giao due Viet Nam, 2010 |2j Du an Viet - Bi: Dgy vd hue lich cue - Mui su
mdt each rdng rai boi r.it nhieu nguven nbtin phuimgphdp vd ki thudt dgy hue
De phuong phap nav tlurc su cd chd dirng [3] Phan Dire Chinh (Tdng chu bien), Tdn Than
trong giao due ddi boi phai cd thdi gian, sir nd <Chu bien), Nguyin Huy Doan, Pham Gia Dire
lire cua nganh giao due va diic biet lii sir quan Truong Cdng fhanh, Nguyen Duy Thuan (2007),
Tudn 9 (tdp hai) Nxb Giiio due
tiim cac thay cd giao , Hy- vpng trong tuong [4j pcs.TS.Nguyln Vii Luong, ThS Dao fhi
lai khdng \ a hpc sinh nude nhii sc tlurdng Hoa, Thlii ki hu sir dgy hue mun Tudn (tai lieu
xuven diro-c hoc tap bciim nluinu phiroim phap 'ap huan giao vien trirdiig trung hgc phd thdng
mdi, hien'dai nhu p b u o n g phap day hoc hgp ^^^y^ ) HiiNdi-2010
.1 ' ' • • , ; , - • [.">] Tgn Quan SJ Cugnn Thlel ke dav hue theo quv
dong gop phan thuc day sir phat trien toan ^^ ^^^^ ^ ^^ cdii\-hiidn Qudc li Dai hgc qudc gia
dien trong eac em Ha Ngi - Trudnu Dai hoc Giao due, 2010
Trang 6Nu Thi Thai vd dtg Tap chi KHOA HOC & CONG NGHE 84(08): 89 - 94
SUMMARY
TEACHING METHOD VIA AGREEMENTS FOR THE REVISION - CHAPTER 3
- SET OF TWO EQUATIONS WITH TWO UNKNOWNS (ALGEBRA GRADE 9)
Vu Thi Thai, Vu Thi Thanh Huyen"
College of Education - TNU
Selecting a suitable teaching method to impart knowledge in the most effective way is not easy at all Teaching method via agreements is one of the new teaching methods, which follows the positive teaching trend in the world nowadays This method specially suits the revision units It is illustrated in this article with the Revision in Chapter 3, Set of two equations with two unknowns -Algebra Grade 9
Key words: Teaching meihud via agreements, teaching d >ssler, teaching plan, Innovalional
assessment, report, and share