а) 2 1/5 = 11/5
11/5-4/5 = 7/5 = 1 2/5
б) 14 5/13 = 187/13
5 7/39 = 202/39
187/13 + 202/39 = 561/39 + 202/39 = 763/202 = 3 157/202
в) 5 = 5/1
5/1 - 3/10 = 50/10 - 3/10 = 47/10 = 4 7/10
д) 5/21+2/3 = 5/21 + 14/21 = 19/21
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