1/3+5/6 3/7-2/9 7/16*8/35
1/3 + 5/6 = 2/6 + 5/6 = 7/6 3/7 - 2/9 = 27/63 - 14/63 = 13/63 7/16*8/35 = 1/2 * 1/5 = 1/10