А) 10 10/11 : 12 = 120/11 • 1/12 = 10/11;
10/11 : 2 21/22 = 10/11 • 22/65 = 4/13;
4/13 • 6 1/2 = 4/13 • 13/2 = 2;
б) 8 : 2 2/5 = 8/1 • 5/12 = 10/3;
5 1/4 : 7 = 21/4 • 1/7 = 3/4;
10/3 : 3/4 = 10/3 • 4/3 = 40/9;
2 1/7 : 5/7 = 15/7 • 7/5 = 3;
4 : 8/9 = 4 • 9/8 = 9/2;
3 : 9/2 = 3 • 2/9 = 2/3;
40/9 : 2/3 = 40/9 • 3/2 = 20/3 = 6 2/3