Автор - Шарапова Валентина
1) 1/4 * 3/3 и 1/6 * 2/2; 3/12 и 2/12; 2) 4/9 * 4/4 и 7/12 * 3/3; 16/36 и 21/36;n
3) 5/6 * 3/3 и 7/18; 15/18 и 7/18; 4) 3/8 * 15/15 и 4/15 * 8/8; 45/120 и 32/120; n
5) 2/15 * 4/4 и 11/12 * 5/5; 8/60 и 55/60; 6) 1/12 * 3/3 и 1/18 * 2/2; 3/36 и 2/36;n
7) 1/24 * 3/3 и 1/18 * 4/4; 3/72 и 4/72; 8) 3/10 * 4/4, 3/8 * 5/5 и 3/4 * 10/10; n
12/40, 15/40 и 30/40.