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出典:Wiktionary
Literally "two from eighty"; duo (“two”) + dē (“from”) + octōgintā (“eighty”)
duodeoctōgintā (indeclinable)
Although duodeoctōgintā is the usual expression for 78, it is also possible to say septuāgintā octō (“seventy-eight”) or octō et septuāgintā (“eight かつ seventy”).
duodeoctoginta