bonjour
a) 5 974 x 10 ²¹ = 5.974 x 10 ³ x 10 ²¹ = 5.974 x 10 ²⁴
b ) 0.000 125 = 1.25 x 10 ⁻⁴
A = 0.00 472 x 10 ⁴² = 4.72 x 10 ⁻³ x 10 ⁴² = 4.72 x 10 ³⁹
B = 931.5 x 10 ³⁶ = 9.315 x 10² x 10 ³⁶ = 9.315 x 10 ³⁸
B > A
G = 712.5 x 10 ⁻²⁶ = 7.125 x 10 ² x 10 ⁻²⁶ = 7.125 x 10 ⁻²⁴
H = 0.728 x 10 ⁻²³ = 7.28 x 10 ⁻¹ x 10 ⁻²³ = 7.28 x 10 ⁻²²
G < H