EXERCITIUL 1 :
(b>15) or c -> Fals
a >= '0' and a <= '9' -> Adevarat
not c or not (a = 'a') -> Adevarat
(a>b) and c -> Fals
EXERCITIUL 2 :
a = ( x*x*x -1 )/(x*(x-3)*(x-1))
b = (a*a + (a+b)*(a+b)*(a+b)) / ( a*b*b ) + a*a*b
c = (4*(a/(b*c) + c) + (a*b)*(a*b)*(a*b) + 3*a/(b*c)) / (2*a*a*a)
EXERCITIUL 3:
if ((a>0 && a<=10) || a==20) c1 = true;
else c1= False;
