Gi¶i mét sè d¹ng ph ¬ng tr×nh
Gi¶i c¸c ph¬ng tr×nh sau:
1 4x4 − 5x2 − = 9 0 2 9x4 + 2x2 − 32 0 =
4 9 2 0
x − x = 4x4 +x2 = 0
3 4x3 − 10x2 + 6x− = 1 0 x3 + 3x2 + 2x= 0
4 (2x− 1) (x+ = + 4) (x 1) (x− 4) (x− 1)(x− 3)(x+ 5)(x+ = 7) 297
(3x2 − 5x+ 1) (x2 − = 4) 0 ( 2 )2 ( )2
2x + −x 4 − 2x− 1 = 0
5 (x+ 3) x− = 1 0 6 x+ = +4 x 2
7 2x+ =5 2x−1 8 x− 4x− =3 2
9 x+ +3 x− =1 2 x2 − 4x+ = − 3 x 1
10 x2 − 4x+ + = 4 x 8
11 2 x− +4 x− =1 2x− +3 4x−16 12 2 5 1
2
x
x + =
13 42 4 5
2
x
x
x + =
− 14 2 1 1 2
x
x + + x =
15 3 2
4
x
x
− 16 1 3 2
2 6
x + x=
2
2
x x
− −
3
x
2
1 ( 1).( 2)
x x
− − +
=
+ + +
NguyÔn §øc Thôy