Выполни сложение смешанных чисел: 3 1/2+ 1 5/6; 8 3/4+ 2 7/8; 6 1/5+1 2/3; 3 4/5-2 3/5; 4 5/6- 2 5/12; 7 5/6-4 2/3. Помогите пожалуйста решить!!!
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