Răspuns :
gandeste ce e divizibil cu 12 pai 6 , 12 atat si dupa faci 6-5=1 12-5=7
x=1, 7
x=1, 7
X+5 sa divida 12
x+1=1,2,3,4,6,12
x+1=1 x=0
x+1=2 x=1
x+1=3 x=2
x+1=4 x=3
x+1=6 x=5
x+1=12 x=11 deci A=(1,2,3,5,11)
x+1=1,2,3,4,6,12
x+1=1 x=0
x+1=2 x=1
x+1=3 x=2
x+1=4 x=3
x+1=6 x=5
x+1=12 x=11 deci A=(1,2,3,5,11)