Вправи 301 - 400 » 359 (12-14)

12) (7/x)–8 = (25/49)8; (7/x)–8 = (49/25)–8; 7/x = 49/25; x = (7•25)/49; x = 25/7 = 34/7. 13) (1/5)–4 = 5x3; 54 = 5x3; x3 = 54 : 5; x3 = 53; x = 5. 14) x = (11/3)–3 – 0,753 = (4/3)–3 – (3/4)3 = (3/4)3 – (3/4)3 = 0.