phan tich da thuc thanh nhan tu pp nhom hang tu

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"#""
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KIỂM TRA BÀI CŨ:

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

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66
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
Tit 11: 
 !" #$%& 
/
,
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-5

x
2
y
2
4x
4
-
+
+
= (x
2

+4x+4) – y
2
= (x+2)
2
- y
2
=(x+2+y)(x+2 –y)
x
2
/7
$89:;9<
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##9=89>
Ví dụ 2
Tit 11: 
 !" #$%& 

x
2
-3x+ xy - 3y
=(x
2
+xy ) + (-3x -3y)
=x( x+y) - 3( x+y)
=(x+y)(x - 3)
Ph©n tÝch ®a thøc thµnh nh©n tö.
*VÝ dô 1
x

2
-y
2
+ 4x +4
=(x
2
+4x+4 ) - y
2
= ( x+2)
2
- y
2
=(x+2+y)(x+2 -y)
*VÝ dô 2
Nhãm c¸c h¹ng tö
thÝch hîp ®Ó xuÊt
hiÖn nh©n tö chung
Nhãm c¸c h¹ng tö
thÝch hîp ®Ó xuÊt
hiÖn h»ng ®¼ng thøc
Tit 11: 
 !" #$%& 