[tex]a) \ \dfrac{(5,1\cdot10^{6})\cdot(1,5\cdot10^{-5})}{1,7\cdot10^{16}} = \dfrac{5,1\cdot1,5}{1,7} \cdot10^{6-5-16} = 4,5\cdot10^{-15}\\\\\\b) \ \dfrac{(6,5\cdot10^{-12})\cdot(5\cdot10^{-18})}{2,5\cdot10^{-30}} = \dfrac{6,5\cdot5}{2,5}\cdot10^{-12-18-(-30)} = 13\cdot10^{0} = 1,3\cdot10[/tex]
[tex]c) \dfrac{(3,6\cdot10^{14})\cdot(1,2\cdot10^{-12})}{(6\cdot10^{-6})\cdot(0,8\cdot10^{12})}=\dfrac{3,6\cdot1,2\cdot10^{14-12}}{6\cdot0,8\cdot10^{-6+12}} = \dfrac{4,32\cdot10^{2}}{4,8\cdot10^{6}} = 0,9\cdot10^{2-6} =\\\\=0,9\cdot10^{-4} = 9\cdot10^{-5}[/tex]
