Вычислите : 1)3/7+4/9; 2)8/9-7/8;3)13/15-2/3;4)20/21+3/7;5)
17/18-11/12;6)7/16+1/6;7)2/9+5/6;8)10/21+9/14;9)7/9-4/15;10)9/14-3/7+15/28 11)1/6+1/4-1/8 12)13/18-29/45+8/15
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