Odpowiedź:
Szczegółowe wyjaśnienie:
log 2 + log 15 + log 3 = log 2 * 15 + log 3 = log 30 + log 3 = log 30 * 3 = log 90
log 7 - log √7 + log 2 = log 7 : √7 + log 2 = log 7 / √7 + log 2 = log 7 * √7 / √7 * √7 + log 2 = log 7√7 / 7 + log 2 = log √7 + log 2 = log √7 * 2 = log 2√7
