8/2/2019 dai 8-Tiet 49

1/9

Tm

KXGii

phngtrnh

BN T DUY

Gii phng trnh cha n mu

Quy

ng vkh mu

r t

lun

ichiu

KXri ktlun

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8/2/2019 dai 8-Tiet 49

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Tit 49 LUYN TP

- Nu cc bc gii phng trnh cha n mu?

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8/2/2019 dai 8-Tiet 49

3/9

Tit 49 LUYN TP

Dng 1: Gii phng trnh

Dng 2: Vn dng gii phng trnhvo bi ton tm s

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8/2/2019 dai 8-Tiet 49

4/9

Bi 1: (29 Sgk trang 22,23).

Bn Sn gii phng trnh (1) nh sau:

(1) x2 5x = 5(x 5)

x2 5x = 5x 25

2x - 5x5

x - 5

Tit 49 LUYN TPDng 1: Gii phng trnh

KX:

x 5

=>

x2 - 10x + 25 = 0

(x 5)2 = 0

x = 5.

Bn H cho rng Sn gii sai v nhn hai v vi biu thc x 5 c

cha n. H gii bng cch rt gn v tri nh sau:

(1) x = 5x(x - 5)

5x - 5

=>

(Khng tha KX) Vy phng trnh v nghim

(Khng tha KX)

Vy phng trnh v nghim

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8/2/2019 dai 8-Tiet 49

5/9

Bi 2. Gii cc phng trnh sau:1 3

, 32 2

xa

x x

Tit 49 LUYN TPDng 1: Gii phng trnh

1 33 (2)

2 2

x

x x

2,1

2 - 4b

x x

1 (3)2 2 2 x x x

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8/2/2019 dai 8-Tiet 49

6/9

Bi 32a. Gii phng tnh sau 21 12 2 ( 1) (4)x

x x

Tit 49 LUYN TP

Dng 1: Gii phng trnh

21 1

(4) 2 2 1 0xx x

KX: x 0

212 (1 1) 0x

x

0)(2

1 2

x

x

2

12 0 (5)

0

x

x

2

1Vy tp nghim ca phng trnh (4) l: S =

x = 0 (khng tha KX)

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8/2/2019 dai 8-Tiet 49

7/9

Bi 33/23SGK. Tm cc gi tr ca a sao cho mi biu thc sau c gi tr bng 2:

3 1 3)

3 1 3

a aa

a a

10 3 1 7 2)

3 4 12 6 18

a ab

a a

Tit 49 LUYN TP

Dng 2: Vn dng gii phng trnh vo biton tm s

3 1 3) 2

3 1 3

a aa

a a

10 3 1 7 2) 2

3 4 12 6 18

a ab

a a

Thc ch t ca vic chnh l gii cc phng trnh sau:

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8/2/2019 dai 8-Tiet 49

8/9

* Bi hc kinhh nghim:- Nhng lu khi gii phng trnh cha n mu

+ Cn tm iu kin xc nh trc khi gii phngtrnh.

Tit 49 LUYN TP

+ S dng du mt cch hp l.

+ C th i du c mu ging nhau.

+ Cn so snh gi tr tm c ca n vi KX rimi kt lun.

- i vi bi ton tm x biu thc A(x) bng a ta quy vgii phng trnh A(x) = a

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