a, 23x - 503 = 32. 23
23x - 503 = 72
23x = 72 + 503
23x = 575
x = 575 : 23
x = 25
Vậy x = 25
b, 38747 - (10425 + x) = 3828 : 12
38747 - (10425 + x) = 319
10425 + x = 38747 - 319
10425 + x = 38428
x = 38428 - 10425
x = 28003
Vậy x = 28003
c, 84 - 6 (x+4) = 48
6. (x+4) = 84 - 48
6. (x+4) = 36
x + 4 = 36 : 6
x + 4 = 6
x = 6 - 4
x = 2
Vậy x = 2
23x -503 = 32 . 23
=> 23x -503 = 72
=> 23x = 72 + 503
=> 23x = 575
=> x = 575 : 23
=> x = 25