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Ответ:

5/16<7/16;

7/13 i 7/16 = 112/208 > 91/208 = 7/13 > 7/16;

3/8 i 1/6 = 9/24 > 4/24 = 3/8 > 1/6;

5/8 i 7/10 = 25/40 < 28/40 = 5/8 < 7/10;

3/7 i 9/21 = 9/21 = 9/21 = 3/7=9/21;

3/5 i 5/8 = 24/40 < 25/40 = 3/5 < 5/8