a) 32x = 81= 34
=> 2x = 4
x = 2
b) 52x-3 - 2.52 = 52.3
52x-3 = 125 = 53
=> 2x - 3 = 3
=> 2x = 6
x = 3
32x = 81
32x = 34
=> 2x = 4
x = 4 : 2
x = 2
52x-3 - 2.52 = 52.3
52x-3 - 2.25 = 25.3
52x-3 - 50 = 75
52x-3 = 75 + 50
52x-3 = 125
52x-3 = 53
=> 2x-3 = 3
2x = 3+3
2x = 6
x = 6 : 2
x = 3
32x = 81
32x = 34
=> 2.x = 4
x = 4 : 2
x = 2
52x - 3 - 2.52 = 52 .3
52x - 3 - 2. 25 = 25 . 3
52x - 3 - 50 = 75
52x - 3 = 75 + 50
52x - 3 = 125
52x - 3 = 53
=> 2x - 3 = 3
2x = 3 + 3
2x = 6
x = 6 : 3
x = 2
tìm x còn ko tìm đc thì làm shao tìm đc ny :)