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Chuyên đề phuơng trình ĐS.L9(P.H)

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Biªn so¹n: ph¹m hinh.
Chuyªn ®Ò
C¸c d¹ng bµi tËp vÒ ph¬ng tr×nh
Bµi tËp 1:
2
2 3 0
4 6 4
16 17 8 23
2 19 2
1
4 2 1 4
x x
x x x
x x
x
x
x x
− − =
− + = +
+ = −
+ −
=
+ = + +

4 1 3 4 1
3 4 4 2
5 1 3 2 1
1 1 8
11 11 4
x x


x x x
x x x
x x x
x x x x
+ − + =
+ + + =
− − − = −
+ − = − +
+ + + − + =
1 1x x x+ + − =
Bµi tËp 2:
8 2 7 8 2 7 4
3 4 1 8 6 1 1
2 3 2 5 2 2 5 2 2
6 9 6 9 6
3
2 1 2 1
2
x x x x
x x x x
x x x x
x x x x
x
x x x x
+ + + + + − + =
+ − − + + − − =
+ + − + − − − =
+ − + − − =
+
+ − + − − =

Bµi tËp 3:
2
2 2
2 2
2 2
6 3
3 2
1
4 1 3
2 2
2
2 2 2 2
3 3
3 3
x
x x
x x
x
x x x x x x
x x
x x
x x
x
x x x x

= + −
− −
− =
+ + − +
+ −

+ =
+ + − −
+ −
+ =
+ + − −
( ) ( )
( )
2
2
2 1 2 2
1 1
4 1 2 10 1 3 2
x x x
x x x
x x x
− − + = −
+ − − =
+ = + − +
- 1 -

Biªn so¹n: ph¹m hinh.
Bµi tËp 4:
( ) ( ) ( ) ( )
( ) ( ) ( ) ( )
( ) ( ) ( )
( ) ( ) ( ) ( )
( ) ( ) ( ) ( )
2
4 5 7 8 4
1 3 5 7 297

1 2 3 24
4 1 12 1 3 2 4 4
4 5 6 10 12 3
x x x x
x x x x
x x x x
x x x x
x x x x x
+ + + + =
− + − + =
+ + + =
+ − + + =
+ + + + =
Bµi tËp 5:
( )
( )
( ) ( ) ( )
2
2
2 2
2 2
2
2
2
1 2
1
1
1
3 2 3 2 2 3
2 8 6 1 2 2

3 2 1
3 2
1
1 3 2 2 3
2
2
4 4 2 3
2
3
1 3 2 1 8
1
x
x
x
x x x x x x
x x x x
x
x x
x
x
x x x x
x
x
x x
x
x
x x x
x
= −



− + + + = + + + −
+ + + − = +
− − = −


− + − + + − =

+
− + − = −

+
− + + − =

Bµi tËp 6:
4 4 2
4 1; 4 12 9 0x x x x x− = − + − =
( ) ( )
( )
( ) ( )
( )
2 2
2 2
2 2
2
2 2
2 2
3 2
25
15; 11

1 5
9 20 2 3 10
3 1 3 1
8 1 3 1
5 1 2 2
x x
x x
x x
x x x
x x x x
x x x x
x x
+ = + =
+ +
+ + = +
+ + = + +
+ = − +
+ = +
( )
( )
2 2
2 2
4 1 1 2 2 1
2 1 2 1 2 1
x x x x
x x x x x
− + = + +
− + − = − −
36112
2

=+++
xxx
xxx
−++=+
24422169
2
- 2 -

Biªn so¹n: ph¹m hinh.
Bµi tËp 7:
( )
( ) ( )
4 2 4 2
2
2 2
4 3
2 2
2
2
5 4 0 ; 2 2 2 2 0
2 23 2 120 0
4 8 5 0
3 3 9
3 168 46 0
2 2
4
x x x x
x x x x
x x x
x x x

x x
x
− + = − + + =
− − − + =
− + − =
 
+ − −
   
+ − =
 ÷
 ÷  ÷
− +

   
 
( ) ( )
( )
(
)
2 2
2
2 2
2
3 15 2 5 1 2
2 4 3 1 10
17 17 9
5 2 1 7 10 3
x x x x
x x x x
x x x x

x x x x
+ + + + =
− + + − + =
+ − + − =
+ − − + + + =
2
2
2 3
2 3
5 1
5 2 4
2
2
2 1
4 2 2
2
12 4
4 12 47
1 1 1
6
x x
x
x
x x
x
x
x x
x
x
x x x

x
x x
+ = + +
+ = + +
+ + + =
+ + + + + =
Bµi tËp 8:
2 2
3 3
2
3
3
3
3
10 2 2 3 1
3 10 5
1 1 2
5 5
1 2 2 1
24 12 6
2 1 1
x x
x x
x x
x x
x x
x x
x x
− − + =
+ + − =

+ + − =
+ + =
+ = −
+ + − =
− + − =
- 3 -

×