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Răspuns:

Explicație pas cu pas:

D₁₅={ 1, 3,5 ,15 } ....................D₁₅= divorii lui 15

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2x+1=1

2x=1-1

2x= 0

x= 0:2

x= 0 ∈N

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2x+1=3

2x=3-1

2x=2

x= 2:2

x=1 ∈N

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2x+1=5

2x=5-1

2x=4

x=4:2

x=2 ∈N

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2x+1=15

2x=15-1

2x=14

x= 14:2

x=7 ∈ N

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D={ 0, 1, 2 , 7 }

D₂₁={ -1 ,1 , 3, -3 , -7 ,7 , 21 -21 }

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2x+1= -1

2x= -1-1

2x= -2

x= -2 :2

x= -1 ∈Z

2x+1=1

2x=1-1

2x=0

x= 0:2

x=0 ∈ Z

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2x+1= -3

2x+1=-3-1

2x=-4

x= -4 :2

x= -2 ∈Z

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2x+1= 3

2x= 3-1

2x=2

x=2:2

x= 1∈Z

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2x+1= -7

2x= -7-1

2x=-8

x= -8:2

x= -4 ∈ Z

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2x+1= 7

2x=7-1

2x= 6

x= 6:2

x= 3 ∈Z

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2x+1=21

2x= 21-1

2x= 20

x= 20:2

x= 10 ∈Z

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2x+1 = -21

2x= -21 -1

2x= -22

x= -22:2

x= -11 ∈Z

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E= {-1 ,1 ,0,- 2 ,-4 ,3 ,10 ,-11 }