Ответ:
5а - 20аb = 5a(1-4b)
5а-20ab = 1*5a-4b*5a = 5a(1-4b)
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Ответ:
5а - 20аb = 5a(1-4b)
5а-20ab = 1*5a-4b*5a = 5a(1-4b)