Ответ:\(7\cdot10^3=7000\).\(4\cdot10^6=4\,000\,000\).\(2\cdot10^9=2\,000\,000\,000\).\(7\cdot10^{-3}=\dfrac{7}{1000}=0{,}007\).\(4\cdot10^{-6}=\dfrac{4}{1\,000\,000}=0{,}000004\).\(2\cdot10^{-9}=\dfrac{2}{1\,000\,000\,000}=0{,}000000002\).