Răspuns:
Explicație pas cu pas:
D₄ = {± 1 ; ± 2 ; ± 4}
x+1 = 1 => x = 1-1 => x = 0
x+1 = -1 => x = -1-1 => x = -2
x+1 = 2 => x = 2-1 => x = 1
x+1 = -2 => x = -2-1 => x = -3
x+1 = 4 => x = 4-1 => x = 3
x+1 = -4 => x = -4-1 => x = -5
D₅ = {± 1 ; ± 5}
x+1 = 1 => x = 1-1 => x = 0
x+1 = -1 => x = -1-1 => x = -2
x+1 = 5 => x = 5-1 => x = 4
x+1 = -5 => x = -5-1 => x = -6
D₆ = {± 1 ; ± 2 ; ± 3 ; ± 6}
x+1 = 1 => x = 1-1 => x = 0
x+1 = -1 => x = -1-1 => x = -2
x+1 = 2 => x = 2-1 => x = 1
x+1 = -2 => x = -2-1 => x = -3
x+1 = 3 => x = 3-1 => x = 2
x+1 = -3 => x = -3-1 => x = -4
x+1 = 6 => x = 6-1 => x = 5
x+1 = -6 => x = -6-1 => x = -7
D₈ = {± 1 ; ± 2 ; ± 4 ; ± 8}
x+1 = 1 => x = 1-1 => x = 0
x+1 = -1 => x = -1-1 => x = -2
x+1 = 2 => x = 2-1 => x = 1
x+1 = -2 => x = -2-1 => x = -3
x+1 = 4 => x = 4-1 => x = 3
x+1 = -4 => x = -4-1 => x = -5
x+1 = 8 => x = 8-1 => x = 7
x+1 = -8 => x = -8-1 => x = -9
D₉ = {± 1 ; ± 3 ; ± 9}
x+1 = 1 => x = 1-1 => x = 0
x+1 = -1 => x = -1-1 => x = -2
x+1 = 3 => x = 3-1 => x = 2
x+1 = -3 => x = -3-1 => x = -4
x+1 = 9 => x = 9-1 => x = 8
x+1 = -9 => x = -9-1 => x = -10
D₁₀ = {± 1 ; ± 2 ; ± 5 ; ± 10}
x+1 = 1 => x = 1-1 => x = 0
x+1 = -1 => x = -1-1 => x = -2
x+1 = 2 => x = 2-1 => x = 1
x+1 = -2 => x = -2-1 => x = -3
x+1 = 5 => x = 5-1 => x = 4
x+1 = -5 => x= -5-1 => x = -6
x+1 = 10 => x = 10-1 => x = 9
x+1 = -10 => x = -10-1 => x = -11
D₁₂ = {± 1 ; ± 2 ; ± 3 ; ± 4 ; ± 6 ; ± 12}
x+1 = 1 => x = 1-1 => x = 0
x+1 = -1 => x = -1-1 => x = -2
x+1 = 2 => x = 2-1 => x = 1
x+1 = -2 => x = -2-1 => x = -3
x+1 = 3 => x = 3-1 => x = 2
x+1 = -3 => x = -3-1 => x = -4
x+1 = 4 => x = 4-1 => x = 3
x+1 = -4 => x = -4-1 => x = -5
x+1 = 6 => x = 6-1 => x = 5
x+1 = -6 => x = -6-1 => x = -7
x+1 = 12 => x = 12-1 => x = 11
x+1 = -12 => x = -12-1 => x = -13
D₁₄ = {± 1 ; ± 2 ; ± 7 ; ± 14}
x+1 = 1 => x = 1-1 => x = 0
x+1 = -1 => x = -1-1 => x = -2
x+1 = 2 => x = 2-1 => x = 1
x+1 = -2 => x = -2-1 => x = -3
x+1 = 7 => x = 7-1 => x = 6
x+1 = -7 => x = -7-1 => x = -8
x+1 = 14 => x = 14-1 => x = 13
x+1 = -14 => x = -14-1 => x = -15
D₁₆ = {± 1 ; ± 2 ; ± 4 ; ± 8 ; ± 16}
x+1 = 1 => x = 1-1 => x = 0
x+1 = -1 => x = -1-1 => x = -2
x+1 = 2 => x = 2-1 => x = 1
x+1 = -2 => x = -2-1 => x = -3
x+1 = 4 => x = 4-1 => x = 3
x+1 = -4 => x = -4-1 => x = -5
x+1 = 8 => x = 8-1 => x = 7
x+1 = -8 => x = -8-1 => x = -9
x+1 = 16 => x = 16-1 => x = 15
x+1 = -16 => x = -16-1 => x = -17
D₁₈ = {± 1 ; ± 2 ; ± 3 ; ± 6 ; ± 9 ; ± 18}
x+1 = 1 => x = 1-1 => x = 0
x+1 = -1 => x = -1-1 => x = -2
x+1 = 2 => x = 2-1 => x = 1
x+1 = -2 => x = -2-1 => x = -3
x+1 = 3 => x = 3-1 => x = 2
x+1 = -3 => x = -3-1 => x = -4
x+1 = 6 => x = 6-1 => x = 5
x+1 = -6 => x = -6-1 => x = -7
x+1 = 9 => x = 9-1 => x = 8
x+1 = -9 => x = -9-1 => x = -10
x+1 = 18 => x = 18-1 => x = 17
x+1 = -18 => x = -18-1 => x = -19
D₂₀ = {± 1 ; ± 2 ; ± 4 ; ± 5 ; ± 10 ; ± 20}
x+1 = 1 => x = 1-1 => x = 0
x+1 = -1 => x = -1-1 => x = -2
x+1 = 2 => x = 2-1 => x = 1
x+1 = -2 => x = -2-1 => x = -3
x+1 = 4 => x = 4-1 => x = 3
x+1 = -4 => x = -4-1 => x = -5
x+1 = 5 => x = 5-1 => x = 4
x+1 = -5 => x= -5-1 => x = -6
x+1 = 10 => x = 10-1 => x = 9
x+1 = -10 => x = -10-1 => x = -11
x+1 = 20 => x = 20-1 => x = 19
x+1 = -20 => x = -20-1 => x = -21
