Question

1)Determinati elementele multimii .A={x€N|18divizibil(x+1)}.2)Stabiliti valoarea de adevar a propozitiilor:a)12€N;0 nu apartine N;1 nu apartine N;{1,2,3,...23}include{6,7,8};{1,2}includeN

Answer 1

1. divizorii lui 18 sunt 2, 3,6,9
x+1=2 x=1
x+1=3 x=2
x+1=6 x=5
x+1=9 x=8
a={1.2.5.8}
2)
a) A
b) F
c) F
d) A
e) F