[tex]\displaystyle{ 2^{3} \cdot 2^{5} : 2^{6} = 2^{3 + 5} : 2^{6} = 2^{8} : 2^{6} = 2^{8-6} = 2^{2} = 4 }[/tex]
Te folosesti de formula [tex]\displaystyle{ a^{x} \cdot a ^{y} = a^{x+y} }[/tex] respectiv [tex]\displaystyle{ a^{x} : a^{y} = a^{x:y} }[/tex]
