Ответ:

  1. \(7\cdot10^3=7000\).
  2. \(4\cdot10^6=4\,000\,000\).
  3. \(2\cdot10^9=2\,000\,000\,000\).
  4. \(7\cdot10^{-3}=\dfrac{7}{1000}=0{,}007\).
  5. \(4\cdot10^{-6}=\dfrac{4}{1\,000\,000}=0{,}000004\).
  6. \(2\cdot10^{-9}=\dfrac{2}{1\,000\,000\,000}=0{,}000000002\).