Répondre :
A = 3×10^10 × 7 × 10^3 / 10^5 × 1, 2 × 10^-3
= (3x7/1.2) 10^(10+3-5-(-3))
= 17.5 x 10^11
B = 5×10^-3 × 12 × 10^3 × 10^-2 / 4 × 10^36
= (5x12/4) 10^(-3+3-2-36)
= 15 x 10^-38
= (3x7/1.2) 10^(10+3-5-(-3))
= 17.5 x 10^11
B = 5×10^-3 × 12 × 10^3 × 10^-2 / 4 × 10^36
= (5x12/4) 10^(-3+3-2-36)
= 15 x 10^-38