4.
3⁻⁹ * 9⁻⁴ = 3⁻⁹ * 9⁻⁴ = 3⁻⁹ * 9⁻⁴ = 3⁻⁹⁻(⁻⁶) * 9⁻⁴⁻(⁻⁶) = 3⁻³ * 9² = 3⁻³ * 3⁴ =3¹ =3
27⁻⁶ (3*9)⁻⁶ 3⁻⁶ * 9⁻⁶
Ответ: 3.
5.
(4,6*10⁴) * (2,5*10⁻⁶) = 4,6*2,5*10⁴⁻⁶=11,5 * 10⁻²= 1,15*10⁻¹
6.
(a⁻¹ +b⁻¹)(a+b)⁻¹= ( 1 + 1 ) ( 1 ) = b+a * 1 = 1
a b a+b ab a+b ab