牧草每天在长,牧场可让十头牛吃贰拾天,或可让拾伍头牛吃拾天。要让草永远都吃不完,场里最多可放多少头牛?
牧草每天在长,牧场可让十头牛吃贰拾天,或可让拾伍头牛吃拾天。要让草永远都吃不完,场里最多可放多少头牛?
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