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Определите знак произведения: а) (−1) * (−1); б) (−1) * (−1) * (−1); в) (−1) * (−1) * (−1) * (−1); г) (−1) * (−1) * (−1) * (−1) * (−1) * (−1) * (−1).

6 классМатематика

Определите знак произведения: а) (−1) * (−1); б) (−1) * (−1) * (−1); в) (−1) * (−1) * (−1) * (−1); г) (−1) * (−1) * (−1) * (−1) * (−1) * (−1) * (−1).

Определите знак произведения: а) (−1) * (−1); б) (−1) * (−1) * (−1); в) (−1) * (−1) * (−1) * (−1); г) (−1) * (−1) * (−1) * (−1) * (−1) * (−1) * (−1).

Решение

Решение: а) (−1) * (−1) = 1; б) (−1) * (−1) * (−1) = ((−1) * (−1)) * (−1) = 1 * (−1) = −1; в) (−1) * (−1) * (−1) * (−1) = ((−1) * (−1)) * ((−1) * (−1)) = 1 * 1 = 1; г) (−1) * (−1) * (−1) * (−1) * (−1) * (−1) * (−1) = ((−1) * (−1)) * ((−1) * (−1)) * ((−1) * (−1)) * (−1) = 1 * 1 * 1 * (−1) = −1. Ответ: а) +; б) −; в) +; г) −.