Вправи для повторення розділу 3 » 38 (1)

Виконайте дії: 1) (x-1)/(x^2+ 2x-3) + (x+1)/(x^2+ 4x+3). x2 + 2x – 3 = 0; D = 22 – 4 • (–3) = 16; x1 = (-2+4)/2 = 1; x2 = (-2-4)/2 = –3. x2 + 4x + 3 = 0; D = 42 – 4 • 3 = 4; x1 = (-4+4)/2 = –1; x2 = (-4-2)/2 = –3. (x-1)/((x-1)(x+3)) + (x+1)/((x+1)(x+3)) = 1/(x+3) + 1/(x+3) = 2/(x+3).