Question

Вычислите:7⁸*7⁻⁵*7⁻⁴

Answer 1

$7^8cdot7^{-5}cdot7^{-4}=7^{8+(-5)+(-4)}=7^{-1}= frac{1}{7}$

Answer 2

7⁸ * 7⁻⁵ * 7⁻⁴ = 7⁸⁺⁽⁻⁵⁾ * 7⁻⁴ = 7⁸⁻⁵ * 7⁻⁴ = 7³ * 7⁻⁴ = 7³⁺⁽⁻⁴⁾ = 7³⁻⁴ = 7⁻¹ или = ¹/₇.