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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2/19
Kim tra bi c
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3/19
Kim tra bi c
Ly v d v 5 n thc .
Hy lp tng cc n thc .
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4/19
Tit 57
pdfMachine - is a pdf writer that produces quality PDF files w ith ease!
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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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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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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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8/19
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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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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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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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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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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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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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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15/19
pdfMachine - is a pdf writer that produces quality PDF files w ith ease!
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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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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
1 32pdfMachine - is a pdf writer that produces quality PDF files w ith ease!
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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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19/19
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