14 + (273-7x).2 = 518
(273-7x).2 = 518 - 14
(273-7x).2 = 504
273-7x = 504 : 2
273-7x = 25
-7x = 252 - 273
-7x = -21
x = 3
Vậy x = 3
- (358-x):5 = 2.52
(358-x):5 = 2.25
(358-x):5 = 50
358 - x = 50.5
358 - x = 250
x = 358 - 250
x = 108
Vậy x = 108
- 60 : 5x = 12
5x = 5
x = 1
Vậy x = 1
- 5x+3.54x - 52x.53x+2 = 100
55x+3 - 55x+2 = 100
(5-1) . 55x+2 = 100
4 . 55x+2 = 100
55x+2 = 25
55x+2 = 52
5x+2 = 2
5x = 0
x = 0
Vậy x = 0
- (4x+2)2 - 1 = 35
8x + 4 - 1 = 35
8x + 4 = 36
8x = 32
x = 4
Vậy x = 4