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Верно ли, что: а) если а > 0 и b > О, то ab > 0; б) если ab > 0, то а > 0 и b > О?

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Ответ:

mayyyyyyka

17.04.2019 03:20

а) верно;
б) не верно.
Пример: а = -1b = -10 и ab = 10 > 0.

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