Вправи 301 - 400 » 349

349. Обчисліть: 1) (((–1)–1)–1)–1 = (–1)–1 = 1/〖(-1)〗^1 = 1/(-1) = –1; 2) ((2–1)–1)–1 = 2–1 = 1/2; 3) 4–4 • (1/4)–5 = 4–4 • 45 = 41 = 4; 4) (21/2)–3 • (2/5)–5 = (5/2)–3 • (2/5)–5 = (2/3)3 • (2/5)–5 = (2/5)–2 = (5/2)2 = 2,52.