Вправи 301 - 400 » 351

351. Знайдіть х, якщо: 1) a–1b24 = a5b–8 • x; x = (a^(-1) b^24)/(a^5 b^(-8) ) = a–6b32. 2) a–1b–1 = x : ab; x = a–1b–1 • ab = a0b0 = 1 • 1 = 1; 3) a–7b26 = x : b–16; x = a–7b26 • b–16 = a–7 • b10; 4) 1,921 = (1,9–3)–x; 1,921 = 1,93x; 3x = 21|: 3; x = 7. 5) (4,5)–20 = (4,5–x)5; (4,5)–20 = (4,5)–5x; –5x = –20|: (–5) ; x = 4.