Răspuns:
Explicație pas cu pas:
a) D₁₈ = { ± 1 ; ±2 ; ±3 ; ±6 ; ±9 ; ±18}
D₂₄ = {±1 ; ±2 ; ±3 ; ±4 ; ±6 ; ±8 ; ±12 ; ±24}
D₁₈ ∩ D₂₄ = { ±1 ; ±2 ; ±3 ; ±6}
b) a = ((-4)²)⁶ : (-4)⁸ : 2³ = 4²ˣ⁶ : 4⁸ : 2³ = 4¹²⁻⁸ : 2³ = 4⁴:2³ = (2²)⁴ : 2³ =
= 2⁸⁻³ = 2⁵ = 32
b = (-7)⁵·(-7)¹²:[(-7)³]⁵ + 13 = (-7)⁵⁺¹² : (-7)³ˣ⁵ + 13 =
= (-7)¹⁷:(-7)¹⁵ + 13 = (-7)¹⁷⁻⁵ + 13 = (-7)²+13 = 49+13 = 62
c = 1-2+3-4+5-6+....+19-20 = (-1)·10 = -20
ma (a,b,c) = (a+b+c)/3 = (32+62-20)/3 = 74/3
#copaceibrainly
