Вправи 301 - 400 » 340 (1-2)

340. Знайдіть х: 1) (–2 • 9)–4 = x • 9–4; 2–4 • 9–4 = x • 9–4 |: 9–4; x = –2–4 = –1/24 = 1/16. 2) (7 • 10)–3 = 7–3 • x; 7–3 • 10–3 = 7–3 • x|: 7–3; x = 10–3 = 1/10^3 = 1/1000.