Question

urgeeeeent11 si 13 va rog

Answer 1

11. A={0,1,2,3,4,5,6,7,8,9} (toate cifrele)
12. A={2}
Rezolvarea ecuatiei:
$2^{a} + 4^{a} =20 \\ 2^{a}+2^{2a}=20 \\ 2^{a}(1+2^{2})=20 \\ 2^{a}*5=20 \\ 2^{a}=4 \\ 2^{a}=2^{2} \\ a=2$