Răspuns:
Buna sper ca e bine! Spune mi daca mai ai nevoie de alte exercitii!!
6. A={n∈N*| n≤3}
A={1,2,3}
B={n∈N*| 2ⁿ≤8}
B={1,2,3}
A=B
7. A={x∈Z| -3<x+5≤3}
-3<x+5≤3 /-5
-8<x≤ -2
A={-7,-6,-5,-4,-3,-2}
B={x∈Z| -6≤x<-2}
B={-6,-5,-4,-3}
a. -5∈A(A)
b. A⊂B(F)
c. ∅⊂B(A)
d. {-1,0,1}⊂A(F)
8. a. A⊃B
b. B⊂A
c. C⊂E
d. B⊄D
9. {2;3;x;9}={2;3;7;9}
x=7
