1. А) 24 * а^3 * b^2/8 * а^2 * b^3 = 3 * a/b Б) (х^2 + 3 * х * у)/)x * у + 3 * у^2) = x * (x + 3 * y)/y * (x + 3 * y) = x/y. 2. А) (а + 3)/(а^2 + а) - 1/(а + 1) + 2/а = (a + 3)/a * (a + 1) – a/a * (a – 1) + 2 * (a + 1)/a * (a + 1) = (a + 3 – a + 2 * a + 2)/a * (a + 1) = (2 * a + 5)/a * (a + 1). 3. а^2/(а^2 – 9) + 3/(а + 3) - а/(а – 3) = а^2/(а^2 – 9) + 3 * (a – 3)/(а + 3) * (a – 3) – а * (a + 3)/(а – 3) * (a + 3) = (a^2 + 3 * a – 9 – a^2 – 3 * a)/ (а^2 – 9) = -9/(а^2 – 9) = -9/-6,75 = 1(1/3).