5b/28 + 9b/28 = (5b+9b)/28 = 14b/28 = (1/2)b = 0,5b
Ответ: 0,5b.
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5b/28 + 9b/28 = (5b+9b)/28 = 14b/28 = (1/2)b = 0,5b
Ответ: 0,5b.