II/ D6 dr)nq-phlrdns tlen:
2. Tin hidudevi ti mf
-ThC loai: nghi luAn chfng minh
-Noi duns rghi luAn: t nghirt to ldn cia "Chf trone cuoc sdns" c6 t chi nghi luc, su kicn .rt s6 thlnh cong.
-Ph4m vi dAn chin8: trong đi sdng.
*Ttm t:
budc lam bei vdn l4p luan chdng minh.
-Hoc sinh doc d€ bei SGK? (H) ME6n lim mot bai van llp luin chfng minh n6i rieng va lem mot bli vin n6i chung b't6c dAu ticr phAi l}n gl? (Tlrn hidu
de)
(H) Tlm hidu de Ia dm hidu nhing mll nlỏ
Q(rc dinh thd lỏi, ycu cdu, noi
cna d€?)
(H) Sau bu6c rim hiCu d6 l} (H) Em hay doc đ va rim t đ bni fen?
(H) Cto bidr m6r bai van nghi lu{n c6 b6 c}c mdy phdn?
-Hoc sinh d9c mA bli SGK? (H) MA ui bai v.n nchi luln c6 nhien .!,rl gỉ NhAn x€t md bni c6 ncu đqc vfn de cdn chfng minh
khong?
-Cau cu6i rrong md bli hu6ng t6i chfng minh
c6 phai le hay siai thlch?
(H) Lap t tonc c6c phdn KB) vdi d€ bai .ren?
(H) VAy mot v6n bAn nghi chfrg rninh rhuong gdm phAn chfth? Neu nhiern vu
(TB,luen luen mdy Iurg
phrn?
-Bai vtu chfns minh c6 nen di ngugc lai c6c quy luat chung d6 khong?
*Hoc sinh dgc cdc doan md bni d mqc 3 SGK?
(H) Khi vi6t rnA bei c6 cdn l6p lu4n khong?
-c6 3 crch nd bei khrc ve c6ch llp lu1n nhu rhd ndỏ
-Cdch m& bli ai c6 phn hgp vdi ycu cdu cria bni khons?
(D Lam th6 nao đ doan đu tien cta than bei len kdr dudc v6i mA bdỉ Cdn lIm gt đ crc doan sau
tap, nh6 hey t6n thdrg c6 cht khong thenh cong. C6 chi se rhinh cong. + Dlln chfng thuc 16: nhtng rfm grdrg c6 chf rna thanh cong: NSuygn Ngoc
Kt.
+ Cdc van dọng vicn thd rhao khuyd. r4r.
2. Lop den bei
a, Md bai: Neu lu{n didm cAn duqc chrtng mirh:
-Vai trd quan rqng cia It tudng, i ve nShi luc lrong cuoc s6ng ma cAu n8trdn dfc kdt -> h mot chan It.
b, Than bei: Chfng minh Neu It l€, dan chfns đ s6ns t6 luan didm).
-ve lt:
+Chf cho con ngr.di vudr trd ng4ị + Kh0n8 c6 chf sc thdl b4ị
-Vd thtc G.
+ Nhilng idm Sudng ihlnh cOnS cta nhtng cor ngudi c6 chị
+ Chi gidp con ngudi vuot qua nhitng
chudns ngai ldn (dan chtng). c, K& bai: Neu t nshia lutn didm 3. Vidt bni
a, M6 bni: C6 thd -Di theng vio vdn -Suy It c{i chung -Suy rt ian li con b, Than bAi
-Phai c6 rt chuydn .idp tien md bai Ghar vay, đns vay) -Vi6t doan phan ttch lt rc.
kgt ph6n -Vi6t doan nou den chnng ticu bidụ c, K& bei
5 1
dgn cni deng. ngudị
cta thAn bAi lien kdr dudc dỏn lxu6c d6?
-Non vidt dỏn ph4n tich It l€ nhu rh6 ndỏ Nen phan dch li le -Ncn neu It lc
hay ngupc I4ỉ (H) Tdong t{ chfng nhu the: *vidr kdt bni:
trudc rdi phan dch dAn
-Hgc sinh dqc nhen x6l I vai do4n ke1 bai d mvc 3?
(H) Kdt bii at dE ho 'lng v6i m6 bei chuả Kdt bei dy da cho thdy luan didm dugc chfng minh 'flr2: Hudng dan luyen t4p
-Goj hAc sinh dqc 2 de bni dong phAn luyen Bp?
(H) Vt! d€ cen chtng rninh 6 ? d€ bli ld gt?
(H) Hai de c6 gi 8i6ns ra khdc so v6i de v{n da lnm meủ
-Gi6o vidn sqi t.
-yeu c.du h9c sinh \C lgp dln Y vdi 2 de tren?
,, HD4l
4. ctnq cd 5. HDVN.
-Neu cdc brrdc lnm bei var hp luln cm? Khau nao quan.rong nhdt? Ve hoc lhuoc shi nhd SGK? Lap den t dC l, 2 phdn luycn tap? -Dqc va soan bei 'ltyen iap l4p 1u4n chfng minh".
-C6 thd srii dr.rng tr) nsn chuyCn do4n (iftn lpr).
-Hoac nllic l4i t trong phdn mA beị 4. Doc lai va stra bni
IỊ LuYen tep
jD!LL: Hey chfns ninh tlnh drins d6n cna c6u tUc ngt "C6 cong mai srt...
kim".
*De 2Cttns minh tfnh chan V tung bni "KhOn8 c6 viCc gl *h6
... et hm ndn"
(H6 chi Minh) *'nm hidu d€:
Ci6ng: thd lo4i chnng minh
-Noi dung yeu cdu: phii b€n lbng, khong ndn chl.
*L4p den t:
-D€ l: khi chfttg minh c& nhfn manh chidu ihuan: he c6 lbns b€n bi quydl tam rht \'iec kh6 CtSn d$u cnng c6 thd hodn ftanh.
-D€ 2: kni chftry thuln - nshich.
minh: chLi , cd 2 chidu -Ngu kh6ng c6ldng kicn id -> khong lirn drJ.dc viec
"Cdn da quygt chl,> rht vi€. l6n lao cnng lam nCn.
Ngev:TiA:92 TiA:92
. LUYEI TAP LAP LUAN CHIJNG MINHỊ Muc tl€u cdn daa