Вправи 301 - 400 » 303

303. Обчисліть: 1) 5 • 90 + 1,5–1 = 5 • 1 + (3/2)–1 = 5 + 2/3 = 52/3; 2) (51/3)0 • (11/3)–1 + 2 • (1/5)–2 = 1 • (4/3)–1 + 2 • 52 = 3/4 + 50 = 503/4 = 50,75; 3) (1/3)–3 : (1/6)–2 • 2–4 = 33 : 62 • 1/2^4 = 27 : 36 • 1/16 = 27/(36•16) = 3/64; 4) –(2,5)–2 • (31/8)–1 = –(–5/2)–2 • (25/8)–1 = –(–2/5)2 • 8/25 = –4/25 • 8/25 = –32/625.