bonjour
A = 3 x 1.2 x 10 ² x ( 10 ⁻³ )⁴ : 0.2 x 10 ⁻⁷
= 3.6 x 10 ² x 10 ⁻¹² : 0.2 x 10 ⁻⁷
= 3.6 x 10 ⁻¹⁰ : 0.2 x 10 ⁻⁷
= 18 x 10 ⁻³
= 1.8 x 10 ⁻²
B = 7 x 5 x 10 ⁸ : 14 x 10 ⁶
= 35 x 10 ⁸ : 14 x 10 ⁶
= 2.5 x 10 ²
C = 12 x 10 ² x 10 ⁻⁶ : 8 x 10 ⁻³
= 12 x 10 ⁻⁴ : 8 x 10 ⁻³
= 1.5 x 10 ⁻¹
D = - 2 x 25 x 10 ² : 50 x ( - 0.1 ) x 10 ⁶
= - 50 x 10 ² : - 5 x 10 ⁶
= 10 x 10 ⁻⁴
= 10 ⁻³