Найдите произведение или частное 21/22*2/5 7/8: 7/16 1целая3/5*2целых1/2 1целая3/4: 10целых1/2

21/22 * 2/5 = 21/55
7/8 : 7/16 = (7/7)*(16/8) = 2
1 3/5  * 2 1/2 = 8/5 * 5/2 = 8/2 = 4
1 3/4 : 10 1/2 = 7/4 : 21/2 = (7*2)/(4*21) = 14/84 = 1/6