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Thirty-seven soldiers had to cross a river.they found an emp

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Thirty-seven soldiers had to cross a river.they found an empty boat by the bank.It could hold no
more than five people each time .how many times did it take the boat to get all the soldiers to the other bank
怎么做
有37个士兵需要过河.他们在河边发现了一艘空船.每次能载仅仅5人.多少次才能把全部士兵运载过河?
8次