Répondre :
B = (15 x 7 x 10^(-3 + 7)) / (500 x 10-²)
= (245 x 10^4) / (500 x 10-²)
= 245 x 10^(4 + 2) / 500
= 245 x 10^6 / 500
= 490000
= 4,9 x 10^5
= (245 x 10^4) / (500 x 10-²)
= 245 x 10^(4 + 2) / 500
= 245 x 10^6 / 500
= 490000
= 4,9 x 10^5