Question

ajutati.ma la ex 9 va rog

Answer 1

9.
a) 3€{0, 1, 3} (A)

b) 2 nu aparține {1, 4, 5} (A)

c) x≤5 => A={5, 4, 3, 2, 1, 0}, x€N, 4€A (A)

d) 0€∅ (F) (mulțimea vidă = niciun nr)

e) x≤3¹⁴ => x≤ (3la 7)²
2²¹= (2la 7)³ => 3la 7<2la 7 => 2=x, 2€A (A)

f) 7≤x<12
x€{7, 8, 9, 10, 11}, 10=x, 10€A (A)

Answer 2

9.) a) 3€ {1,2,3} (adevarat)
b) adevarat
c) adevarat
d)  adevarat 0 € multime vida (fara nici un element)
e) adevarat
f) adevarat