donner l'écriture scientifique en détaillant les étapes
A = 3 x 10⁻⁴ x 1.5 x 10⁻⁷/(10⁻⁶ x 9)
= 3 x 1.5 x 10⁻⁴⁻⁷/(10⁻⁶ x 3 x 3)
= 1.5 x 10⁻¹¹/10⁻⁶ x 3
= 1.5 x 10⁻⁶ x 10⁻⁵/10⁻⁶ x 3
= 1.5 x 10⁻⁵/3
= 0.5 x 10⁻⁵
= 5 x 10⁻⁶
A = 5 x 10⁻⁶
B = 7 x 10¹⁶ x 9 x 10⁻³/21 x 10¹⁷
= 7 x 9 x 10¹⁶ x 10⁻³/21 x 10¹⁷
= 7 x 3 x 3 x 10¹⁶⁻³/7 x 3 x 10¹⁷
= 3 x 10¹³/10¹⁷
= 3 x 10¹³ x 10⁻¹⁷
= 3 x 10¹³⁻¹⁷
= 3 x 10⁻⁴
B = 3 x 10⁻⁴
C = 3.5 x (10⁻³)² x 8 x 10⁻¹/7 x 10⁻⁹
= 3.5 x 8 x 10⁻³ˣ² x 10⁻¹/7 x 10⁻⁹
= 28 x 10⁻⁶ x 10⁻¹/7 x 10⁻⁹
= 4 x 7 x 10⁻⁶⁻¹/7 x 10⁻⁹
= 4 x 10⁻⁷/10⁻⁹
= 4 x 10⁻⁷ x 10⁹
= 4 x 10⁻⁷⁺⁹
= 4 x 10²
C = 4 x 10²
