Решите 1/3*1 2/11*9/13и еще(2 2/3+5/6)*2 8/21

8 1/3*1 2/11*9/13 = 25/3 * 13/11 * 9/13 = 25/3 * 1/11 * 9/1 = 225/33 = 6 27/33 = 6 9/11
и еще(2 2/3+5/6)*2 8/21 = (2 4/6 + 5/6) * 50/21 = 2 9/6 * 50/21 = 2 3/2 * 50/21 = 7/2 * 50/21 = 1/1 * 25/3 = 25/3 = 8 1/3