bonjour
A = 10 ⁻⁷ x 10 ⁻² x 10 ⁵ = 10 ⁻⁴
B = 7 ²¹
C = 6 ³
D = 10 ²¹ sur 2 ²¹ = 5 ²¹
A = 15 x 10 ² x 4 x 10 ⁻⁶ = 60 x 10 ⁻⁴ = 6 x 10 ⁻³
B = ( 2.5 x 10 ⁹) ² = 2.5 x 10 ¹⁸
C = 12 x 10 ² = 1.2 x 10 ³
