выполните действия : а) 9/56-(7/15-5/12) * (3/14 + 1/2)

а) 9/56-(7/15-5/12) * (3/14 + 1/2) = 31/3921) 7/15 - 5/12 = 28/60 - 25/60 = 3/60 = 1/202) 3/14 + 1/2 = 3/14 + 7/14 = 10/14 = 5/73) 9/56 - 1/20 = 45/280 - 14/280 = 31/2804) 31/280 * 5/7 =  31/56 * 1/7 = 31/392