Найдите разность дробей.Сделайте проверку сложением.
а)5/5 и 2/5;     в)6/7 и 2/7;   д)10/11 и 9/11;   ж)12/13 и 7/13;

б)4/9 и 2/9;  г)7/10 и 1/10;    е)3/6 и 2/6;        з)9/15 и 2/15.
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