Раскройте скобки и найдите значение выражения:
а) 3,96 + (2,375 - 3,96);
б) (2 целых 3/7 + 1 целую 5/9) - (1 целая 4/7 + 5/9);
в) - (5/6 + 1,37) - (2,87 - 1/3). 
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