bonjour
A = 45 x 10 ¹² x 4 x 10 ⁻²⁶
A = 45 x 4 x 10 ⁻¹⁴ les puissances s'additionnent = cours
A = 180 x 10 ⁻¹⁴
A = 1.8 x 10 ⁻¹²
B = 12 x 10 ⁻⁵ x 5 x 10 ⁻⁵
B = 12 x 5 x 10 ⁻¹⁰
B = 60 x 10 ⁻¹⁰ = 6 x 10 ⁻⁹
C = 2.7 x 10 ¹³ x 15.1 x 10 ⁻⁸
C = 2.7 x 15.1 x 10 ⁵
C = 40.77 x 10 ⁵
C = 4.077 x 10 ⁶