8/2/2019 dai 7-tiet 57

1/19

cho mng

Cc em h c sinh lp 7C; e

Thit k & thc hin : Nguyn Th HngTr- ng THCS Minh Khai - TP Thanh Ho

Cc em h c sinh lp 7C; e

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8/2/2019 dai 7-tiet 57

2/19

Kim tra bi c

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8/2/2019 dai 7-tiet 57

3/19

Kim tra bi c

Ly v d v 5 n thc .

Hy lp tng cc n thc .

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8/2/2019 dai 7-tiet 57

4/19

Tit 57

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8/2/2019 dai 7-tiet 57

5/19

22 12

x yyx

Xet cac bieu thc:a,Vit biu thc biu th din tch ca hnh to bi mttam gic vung v hai hnh vung dng v pha ngoi

trn hai cnh gc vung x , y ca tam gic .

x y

b,Cho cc n thc .-5x2y ; 4x3yz ; 2xy3 ; 10

Hy lp tng cc n thc 2 2 13 3 3 5 x y xy x y xy x

Cc biu thc trn l nhng v d v a thc .

-5x2

+ 4x3

z + 2x3

+ 10

c,

(2)

(3)

a thc la mottongcuanhng n thc.Moin thctrong tong goi la mothang t

cua a thc o.

a thcl g

2 2 1( 3 ) 3 ( 3) ( ) 5

2 x y xy x y xy x

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8/2/2019 dai 7-tiet 57

6/19

a thc 3x2 y2 + 5xy2 7xc th - c vit nh- sau

3x2 + (-y2 ) + 5xy2 + (-7x)a thc trn c cc hng t l :

2

-2 2

-

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8/2/2019 dai 7-tiet 57

7/19

?1 Hy vit 1 a thc v ch r cc hng t ca a thc :

2 2 1

3 3 3 52 x y xy x y xy x

Cc hng t ca a thc trn l :

x2y ; -3xy ; 3x2y ; - 3 ; 5; xy ;1

x

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8/2/2019 dai 7-tiet 57

8/19

Trong cc biu thc sau , biu thc no l a thc ?

2, 3xay

3 33 1,

4

x yb

2

3 33 1

4 4 4

x y L a thc

, xc

2, 5 3 2d x x

, ( 1 )e x y2, 5 f x y

x xy L a thc

L a thc

L a thc

*/ Ch : Mi n thc - c coi l 1 a thcpdfMachine - is a pdf writer that produces quality PDF files w ith ease!Get yours now !

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8/2/2019 dai 7-tiet 57

9/19

Xt a thc sauA = x2y - 3xy + 3x2y - 3+ xy - x + 5

= ( ) + ( ) + ( )

x2y + 3x2y- 3xy + xy- 3 + 5

+

= 4x2y - 2xy +2

- x

Ta gi a thc 4x2y 2xy + 2 x l dng thu gnHy ch ra cc hng tng dng

vi nhau trong a thc trn ?

- x

c a a t c2/ Thu gn a thc

a thc thu gn l a thc khng cn hai hng t no ng dng.

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8/2/2019 dai 7-tiet 57

10/19

Khi thu gn a thc, bn Hoa lm nh- sau:58753 22 xxyxxyM

)57()85()3(22

xxxyxy

21322

xxy

Bn Hoa lm ng hay sai? V sao?

Bi tp:

+ (-

Bn Hoa lm sai.

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8/2/2019 dai 7-tiet 57

11/19

Tnh gi tr ca a thc P ti x = 0,5 v y = 1

2 2 2 21 1 15 P x y xy xy xy xy x y

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8/2/2019 dai 7-tiet 57

12/19

a thc :2 5 4 6 1M x y xy y

a thc M c cc hng t l :2 5x y4xy

6

co bac la :

co bac la :

co bac la :

7

5

6

M l a thc thu gn

Bc ca a thcl g ?

1

co bac la : 0Bac cao nhat trong cac bac la: 7Ta noi 7 la bac cua a thc M.

Bc ca a thc l bc ca hng t cbc cao nht trong dng thu gn ca athc pdfMachine - is a pdf writer that produces quality PDF files w ith ease!

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8/2/2019 dai 7-tiet 57

13/19

3/ Bc ca a thc:*/Bc ca a thc l bc ca hng t c

bc cao nht trong dng thu gn ca a thc*/ Ch :

- S 0 cng - c gi l a thc v n khng

.-Khitm bc ca 1 a thc, tr- c ht ta phithu gn a thc .

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8/2/2019 dai 7-tiet 57

14/19

?3: Tm bc ca a thc:

5 3 2 51 33 3 22 4

Q x x y xy x

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8/2/2019 dai 7-tiet 57

15/19

pdfMachine - is a pdf writer that produces quality PDF files w ith ease!

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8/2/2019 dai 7-tiet 57

16/19

Cu hi s 1 : lt gi to l x (/kg )

v gi nho l y ( / kg) . Hyvit biu thc biu th s tin

Cu hi s 2Tm bc ca a thc sau :

4 2 45 3 5 5Q x xy x y x

Cu hi s 3 :Tnh gi tr ca biu thc sau

A = x6y + y64zx6y -y6

Bn chn mt chbtk v tr li cuhi trong ch

.

Biu thc ny c l a thc

khng .

p n : 5x +8yBiu thc ny c l a thc

p n:Q c

bc 3

p n : A = 20

-. ch s - c mra .Sau khi m chbn s on

- c tn ca ng- ianh hng .

(1914 1931 )

Ng- i on vin u tinca on thanh nin

Cng sn H Ch MinhpdfMachine - is a pdf writer that produces quality PDF files w ith ease!

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8/2/2019 dai 7-tiet 57

17/19

Cu hi s 1 : lt gi to l x (/kg )

v gi nho l y ( / kg) . Hyvit biu thc biu th s tin

Cu hi s 2Tm bc ca a thc sau :

4 2 45 3 5 5Q x xy x y x

Cu hi s 3 :Tnh gi tr ca biu thc sau

A = x6y + y64zx6y -y6

.

Biu thc ny c l a thc

khng .

p n : 5x +8yBiu thc ny c l a thc

p n : A = 20

-

(1914 1931 )

Ng- i on vin u tinca on thanh nin

Cng sn H Ch Minh

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8/2/2019 dai 7-tiet 57

18/19

Thuc cc nh ngha : a thc , bc ca a thcLm cc bi tp : 24 , 25 , 26 , 28 trang 38 SGKc tr- c bi:Cng tr a thc trang 39 SGKn li cc tnh cht ca php cng cc s hu t.

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8/2/2019 dai 7-tiet 57

19/19

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