Г) 4/5 * 2/3 + 2/3 * 2/5 = 2/3 * (4/5 + 2/5) = 2/3 * 6/5 = 4/5
д) 1 1/3 * 5/14 - 1 1/3 * 1/7 = 1 1/3 * (5/14 - 1/7) = 1 1/3 * (5/14 - 2/14) = 1 1/2 * 3/14 = 4/3 * 3/14 = 2/7
е) 12,9 * 3/8 - 11,3 * 3/8 = 3/8 * (12,9 - 11,3) = 3/8 * 1,6 = 3/8 * 1 3/5 = 3/8 * 8/5 = 3/5