Răspuns:
Explicație pas cu pas:
a) x ∈ {-1, 1, -2, 2, -4, 4, -8, 8}
b) x ∈ {1, 2, 3, 6}
c) 2-x ∈ {-1, 1, -2, 2, -3, 3, -6, 6, -9, 9, -18, 18} → -x ∈ { -3, -1, -4, 0, -5, 1, -8, 4, -11, 7, -20, 16} → x ∈ {3, 1, 4, 0, 5, -1, 8, -4, 11, -7, 20, -16}
d) 3-x ∈ {1, 2, 3, 4, 6, 12} → -x ∈ { -2, -1, 0, 1, 3, 9} → x ∈ {2, 1, 0, -1, -3, -9}
e) 2x-1 ∈ {1, 3, 5, 15} → 2x ∈ { 2, 4, 6, 16} → x ∈ { 1, 2, 3, 8}
f) 2x+1 ∈ {-1, 1, -3, 3, -7, 7, -21, 21} → 2x ∈ {-2, 0, -4, 2, -8, 6, -22, 20} → x ∈ { -1, 0, -2, 1, -4, 3, -11, 10}
