Question

Puteti sa ma ajutati la acest ex. E urgent!!! Ofer 20 puncte!!! 8 si 9

Answer 1

Răspuns:

8.

A = { x I x∈N, x≤12}⇒A={0,1,2,3,4,5,6,7,8,9,10,11,12}

B = { x I x∈N, x numar par,  x ≤ 16}    B={0,2,4,6,8,10,12,14,16}

C = { x I x∈N, x numar impar,  x ≤ 15}  C ={1,3,5,7,9,11,13,15}

D = { x I  x = 3n ≤ 15, n∈N}

E = { x I x = n² ≤ 36 n∈N}

9.

a) 5x + 4 =19

5x =19 -4

5x = 15

x =3

A={3} multime finita

b)

x - 7 < 3

x < 7+3

x< 10∈N

B∈ {1,2,3,4,5,6,7,8,9}  este multime finita

C este multime infinita

C ∈ {0 , 3 , 6, 9, 12..................}

D este multime infinita

D ∈ { 1 , 4, 7 ,10 .....}

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