Răspuns :
Fie a - numarul (necunoscut)
{[(a ÷ 8) × 2] ÷ 4} ÷ 2 = 4
a = (4 × 2 × 4 ÷ 2) × 8
a = (8 × 4 ÷ 2) × 8
a = (32 ÷ 2) × 8
a = 16 × 8
a = 128
a : 8 × 2 : 4 : 2 = 4
a : 8 × 2 : 4 = 4 × 2
a : 8 × 2 : 4 = 8
a : 8 × 2 = 8 × 4
a : 8 × 2 = 32
a : 8 = 32 : 2
a : 8 = 16
a = 16 × 8
a = 128 => numărul
