Ôn thi vào THPT chủ đề: Phương trình

Gi¶i mét sè d¹ng ph ¬ng tr×nh

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Gi¶i c¸c ph¬ng tr×nh sau:
1. 4 x 4 − 5 x 2 − 9 = 0

2. 9 x 4 + 2 x 2 − 32 = 0

x4 − 9 x2 = 0
3. 4 x3 − 10 x 2 + 6 x − 1 = 0
4. ( 2 x − 1) ( x + 4 ) = ( x + 1) ( x − 4 )

( 3x

2

4x4 + x2 = 0
x 3 + 3x 2 + 2 x = 0
( x − 1)( x − 3)( x + 5)( x + 7) = 297

− 5 x + 1) ( x 2 − 4 ) = 0

( 2x

5. ( x + 3) x − 1 = 0
7. 2 x + 5 = 2 x − 1
9. x + 3 + x − 1 = 2
10. x 2 − 4 x + 4 + x = 8

15.

x −2
x3

+ x2 − 4 = 0

4− x
x − 3x + 6
1
=
2
x −9
x −3
2
4
−x − x + 2
=
x + 1 ( x + 1).( x + 2)
2

2

+ x − 4 ) − ( 2 x − 1) = 0
2

2

6. x + 4 = x + 2
8. x − 4 x − 3 = 2
x2 − 4 x + 3 = x −1
2x + 5

=1
x−2
14. 2 x + 1 + 1 = 2
1+ x
2 2x
1
3
16.
+
=2
x−2 6− x
x+2
6
+3=
x −5
2− x

11. 2 x − 4 + x − 1 = 2 x − 3 + 4 x − 16
4
13. x 2 + 4 = 5 x

2

12.

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NguyÔn §øc Thôy