TÌM X  N SAO CHO

Bài 4. Tìm x  N sao cho:

a) ( x 1 )

2

= 1 b) 7

2 x 6

=

49 c) ( 2x 16 )

7

= 128

d) 565 13.x − = 370 e) 105 ( 135 7x : 9 ) = 97 f) 275 ( 113 x + + ) 63 158 =

g) 3. x ( + 2 : 7 .4 ) = 120 h) x(x 1)

− =

0 i) ( x 2 x 4 + )( − = ) 0

k) ( x 140 : 7 ) = − 3

3

2 .3

3

l) x .x

3

2

=

2 : 2

8

3

m) 3

x 3

3

2

=

2.3

2