Вправи 201 - 342 » 231

231. Обчисліть значення виразу: 1) 3–1 – 4–1 = 1^(\4)/3 – 1^(\3)/4 = 1/12; 2) 2–3 + 6–2 = 1/2^3 + 1/6^2 = 1^(\9)/8 + 1^(\2)/36 = 9/72 + 2/72 = 11/72; 3) (2/7)–1 + (–2,3)0 – 5–2 = 7/2 + 1 – 1/5^2 = 3,5 + 1 – 1/25 = 4,5 – 0,04 = 4,46; 4) 9 • 0,1–1 = 9 • (1/10)–1 = 9 • 10 = 90;1 5) 0,5–2 • 4–1 = (1/2)–2 • 1/4 = 22 • 1/4 = 4 • 1/4 = 1; 6) (2–1 – 8–1 • 16)–1 = (1/2 – 1/8 • 16)–1 = (1/2 – 2)–1 = (–11/2)–1 = (–3/2)–1 = –2/3.