А) 14/35 * 25/49 = 10/49; б) 8 2/21 * 7 = 83/21 * 7 = 83/3 = 27 2/3; в) 4 4/11 * 4 7/12 = 45/11 * 55/12 = 75/4 = 18 3/4 = 18,75; г) (1 1/4)³ = 5/4 * 5/4 * 5/4 = 125/64 = 1 61/64. д) 1 7/56 * 3 8/9 - 2,7 = 63/56 * 35/9 - 2,7 = 5/2 - 2,7 = 2,5 - 2,7 = -0,2.