Question

12(x-1):3=4^3+2^3

 

Answer 1

   \(12\left(x-1\right):3=4^3+2^3\)

⇔ \(12x-12:3=72\)

⇔      \(12x-12=216\)

⇔              \(12x=228\)

⇔                  \(x=19\)

 

Answer 2

Ta có:
12(x - 1) : 3 = 4^3 + 2^3
<=> 12 (x-1) : 3 = 64 + 8 ( Do 4^3 = 64 và 2^3 = 8 )
<=> 12(x-1) : 3 = 72
<=> 12(x-1) = 72.3
<=> 12(x-1) = 216
<=> x -1 = 216 : 12
<=> x -1 = 18
<=> x = 18 +1
<=> x = 19
Vậy :x=19