Răspuns :
[(a×3):2]×2=18
(a×3):2=18:2
(a×3):2=9
a×3=9×2
a×3=18
a=18:3
a=6
mersul invers.
n = numărul
3 × n : 2 × 2 = 18
3 × n : 2 = 18 : 2
3 × n : 2 = 9
3 × n = 9 × 2
3 × n = 18
n = 18 : 3
n = 6
[(a×3):2]×2=18
(a×3):2=18:2
(a×3):2=9
a×3=9×2
a×3=18
a=18:3
a=6
mersul invers.
n = numărul
3 × n : 2 × 2 = 18
3 × n : 2 = 18 : 2
3 × n : 2 = 9
3 × n = 9 × 2
3 × n = 18
n = 18 : 3
n = 6