2целых 5/8 ÷ 3 целых 1/16

2целых 5/8 : 3целых 1/16 = 21/8 : 49/16 = 21/8 * 16/49 = (21 * 16) / (8 * 49) = (3 * 2) / (1 * 7) = 6/7

2 5/8:3 1/16=21/8:49/16=6/7