[tex]a)~~~2^{33}-2^{32} = 2^{31}(2^2-1)=2^{31}(4-1) = \boxed{3\times 2^{31}~\vdots~3}\\\\
b)~~~3^{20}+3^{22}=3^{20}(1+3^2)=3^{20}(1+9) = \boxed{10\times 3^{20}~\vdots~5}\\\\
\text{Am corectat greseala din enuntul tau la b).}\\
\text{Am scris }3^{20}~\text{in loc de } 2^{20}
[/tex]
