Răspuns:
[tex]\boldsymbol{ \red{ 4 }}[/tex]
Explicație pas cu pas:
1 + {2 + 3 × [4 + 5 × (6 - x)] : 7} : 8 = 2
{2 + 3 × [4 + 5 × (6 - x)] : 7} : 8 = 2 - 1 = 1
2 + 3 × [4 + 5 × (6 - x)] : 7 = 1 × 8 = 8
3 × [4 + 5 × (6 - x)] : 7 = 8 - 2 = 6
3 × [4 + 5 × (6 - x)] = 6 × 7 = 42
4 + 5 × (6 - x) = 42 : 3 = 14
5 × (6 - x) = 14 - 4 = 10
6 - x = 10 : 5 = 2
x = 6 - 2
x = 4
Verificare: 1 + {2 + 3 × [4 + 5 × (6 - 4)] : 7} : 8 = 1 + {2 + 3 × [4 + 5 × 2] : 7} : 8 = 1 + {2 + 3 × [4 + 10] : 7} : 8 = 1 + {2 + 3 × 14 : 7} : 8 = 1 + {2 + 42 : 7} : 8 = 1 + 1 + {2 + 6} : 8 = 1 + 8 : 8 = 1 + 1 = 2 (corect!)
