Bonsoir
A = (5 / - 42 ) : ( 5/56 )
= - 5/42 x 56/5
= - 280/210
= - 4/3
B = 10 : 10 ⁻² = 10 ¹
N = 3 x 10 ⁻⁶ x 7 x 10 ⁻⁹ x 2 x 10 ⁹
N = 42 x 10 ⁻⁶
C = 0.0071 x10 ³ = 7.1 x 10 ⁻³ x 10 ³ = 7.1 x 10 ⁰ = 7.1
