Вправи 301 - 400 » 366 (5)

5) (0,25 – x–2) • ((1/15)–2 – 302 • 0,52) = 0; (1/4 – x–2)(152 – 152) = 0; (1/4 – x–2) • 0 = 0; x–2 = 1/4; 1/x^2 = 1/4; x2 = 4; x2 – 4 = 0; (x – 2)(x + 2) = 0; x – 2 = 0, або x + 2 = 0; x = 2; x = –2.