Объяснение:
1/(3+√15) + 1/(3-√15) = (3-√15+3+√15)/(9-15) =6/(-6) = -1
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Объяснение:
1/(3+√15) + 1/(3-√15) = (3-√15+3+√15)/(9-15) =6/(-6) = -1