А1. А) Срочно.........
(2а + 8) /(b + 3) * (3b + 9) / (a^2 - 16) = 2(a + 4) / (b + 3) * 3(b +3) / (a - 4)(a + 4 ) = (2 * 3) /(a - 4) = 6 / (a - 4)