Question

Exercitiul 17, va rog ajutati-ma.Am prima ora mate!Va rog urgent!!!

Answer 1

a) xdivide   12 x=1,2,3,4,6,12

A={1,2,3,4,6,12}

b)x+1  divide 1=>   x=0

B={0}

(n+5)/n=n/n+5/n=1+5/n.Acest    numar    e    natural    daca 5/n    este   numar    natural adica    n    divizor    al    lui    5

n={1,5]

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18)  (n+5)/n=n/n+5/n=1+5/n   Acest    numar    este   natural   daca

5/n =nr   natural=> n=1sau 5

c)x+3 divide 3

x+3=1   nu are    solutii   in   N

x+3=3=> x=0

C+{0}

d)X+2   divide     6

x+2={1,2,3,6}

x+2=1 imposibil

x+2=2=> x=0

x+2=3  =>x=3-2=1

x+2 =6 x=6-2=4