(19*10^ 2) ^2 * (15*10 ^ -5)
(5*10^2) ^2 * (17*10 ^ -5)
(16*10 ^-2) ^ 2 * (15*10^3)
(5*10 ^-2) ^ 4 * (16*10^5)

1)(19*10²)² * (15*10⁻⁵) =  19² * 10⁴ * 15 * 10⁻⁵ = 5415*10⁴⁻⁵=5415 * 0,1 = 541,52)(5*10²)² * (17*10⁻⁵)=5² * 10⁴ * 17 * 10⁻⁵ = 25 * 17 * 10⁴⁻⁵ = 425 * 0,1 = 42,53) (16*10⁻²)² * (15*10³) = 16² * 10⁻⁴ * 15 * 10³ = 256 * 15 * 10⁻⁴⁺³ = 3840 * 0,1 == 3844)(5*10⁻²)⁴ * (16*10⁵) =  5⁴ * 10⁻⁸  * 16 * 10⁵  = 5⁴ * 2⁴ * 10⁻⁸⁺⁵ == (5 * 2)⁴ * 10⁻³ = 10⁴ * 10⁻³ = 10⁴⁻³ = 10¹ = 10