Ответы на вопрос:
3 1/3 + 1 1/4 = 10/3 + 5/4 = 40/12 + 15 /12 = 55/12 = 4 7/12
5 1/8 - 4 1/2 = (4 + 1 1/8) - (4 + 1/2) = 4 - 4 + 1 1/8 - 1/2 = 9/8 - 1/2 = 9/8 -4/8 = 5/8
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