8/2/2019 dai 8-tiet 16

1/11

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8/2/2019 dai 8-tiet 16

2/11

Kim tra bi c

Thc hin php tnh:

a). ( 6x3y2 ) : 3xy2 =2x

2

b). (- 9x2y3 ) : 3xy2

c). ( 5xy

2

) : 3xy

2=

= - 3xy

5

3

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8/2/2019 dai 8-tiet 16

3/11

pd f Machine

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8/2/2019 dai 8-tiet 16

4/11

Cho n thc 3xy2

- Vit mt a thc c cc hng t u chia ht cho 3xy2

- Chia cc hng t ca a thc cho 3xy2

- Cng cc kt qu va tm - c vi nhau.

?1

-Chia cc h n t ca a thc cho n thc

Mun chia mt a thccho mt n

thc(trong tr- ng hpchia ht) ta chia nh-

th no?

-Cng cc kt qu va tm - c vi nhau

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8/2/2019 dai 8-tiet 16

5/11

pd f Machine

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8/2/2019 dai 8-tiet 16

6/11

V d: Thc hin php tnh.

(20x4y-25 x2y2 - 3x2y) :5 x2y

Ch : trong thc hnh ta c th tnh nhm

v m s p p n rung g an

VD: (20x4y - 25x2y2 - 3x2y) : 5x2y

= 4x2

5y5

3

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8/2/2019 dai 8-tiet 16

7/11

a.Khi thc hin php chia (4x4-8x2y2+12x5y):(- 4x2)

Bn Hoa vit:

(4x4-8x2y2+12x5y ) = - 4 x2(-x2 + 2y2 - 3x3y)

?2

AB

Q

Tho lun nhm bn thc hin ?2a thi gian 2pht

n x - x y + x y : - x = -x + y - x y

Em hy nhn xt bn Hoa gii ng hay sai ?

p n:- Li gii ca bn Hoa l ng .

- V ta bit rng : nu A = B.Q th A : B = Qpd f Machine

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8/2/2019 dai 8-tiet 16

8/11

Nhn xt :

thc hin php chia (4x4- 8x2y2+12x5y ) : (- 4x2 ) ta

c th phn tch a thc ( 4x4 - 8x2y2 + 12x5y ) thnhnhn t bng cch t nhn t chung l - 4x2 :

(4x4 - 8x2y2 + 12x5y): (- 4x2)

Nh- vy c 2 cch chia a thccho n thc

Cch 1: Lm nh- quy tc.Cch 2: Phn tch a thc

thnh nhn t ri thc hin phpchia.

= - 4x2(-x2 + 2y2 - 3x3y ): (- 4x2)

= -x2 + 2y2 - 3x3y

b. Lm tnh chia: (20x4y - 2 5 x2y2 - 3x2y): 5x2y

(lm theo 2 cch)pd f Machine

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8/2/2019 dai 8-tiet 16

9/11

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8/2/2019 dai 8-tiet 16

10/11

Bi tp1 : Cho cc a thc v n thc

A= 5x3 - 4x2 + 6x B = 2xC = 1 5 x4 +17x3y D = 6x3

Hy vit tt c cc php chia (v kt qu) c th

c - c c c a c, n c r n

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8/2/2019 dai 8-tiet 16

11/11

Bi tp2 : in ng () sai (S) .

Cho A= 5x3 - 4x2 + 6x B = 2x

C=15x4 +17x3y D = 6x3

ng n HAY SAIA khng chia ht cho B v 5 khng chia ht cho 2

A chia ht cho B v mi hng t ca A u chia htcho B

C chia ht cho D v mi hng t ca C u chia htcho D

S

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