Решение:
- а) 530000 = 5,3 ⋅ 10⁵
- б) 0,00072 = 7,2 ⋅ 10⁻⁴
- в) 349 ⋅ 10⁻⁴ = 3,49 ⋅ 10² ⋅ 10⁻⁴ = 3,49 ⋅ 10(2-4) = 3,49 ⋅ 10⁻²
- г) 0,086 ⋅ 10⁻⁷ = 8,6 ⋅ 10⁻² ⋅ 10⁻⁷ = 8,6 ⋅ 10(-2-7) = 8,6 ⋅ 10⁻⁹
Ответ: а) 5,3 ⋅ 10⁵; б) 7,2 ⋅ 10⁻⁴; в) 3,49 ⋅ 10⁻²; г) 8,6 ⋅ 10⁻⁹.