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2014-05-10T19:47:14+02:00
C = ( 2x10⁻⁸x14x10²)/7x10³
=
  2x14/7 x 10⁻⁸x10²/10³
=2x7x2/7 x 10⁽⁻⁸⁺²⁾/10³
=4 x 10⁻⁶/10³
=4 x 10⁽⁻⁶⁻³⁾
=4x10⁻⁹