Bonsoir,
(2³×10⁴)×(2⁵×10⁹) / 2⁷×10¹³
=(10×20³)×(2⁵×10⁹)/2⁷×10¹³
=(10×20³)×(32×10⁹)/2⁷×10¹³
=10×20³×32×10⁹/2⁷×10¹³
=10×20³×2⁵×10⁹/2⁷×10¹³
=10×20³×2⁵×10⁹/2⁷×10¹²
=5³×4³×2⁵×10⁹/2⁷×10¹²
=5³×4³×10⁹/2²×10¹²
=5³×2⁶×10⁹/2²×10¹²
=5³×2⁶/2²×10³
=5³×2⁴/10³
=5³×2⁴/2³×5³
=2⁴/2³
=2
