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Python二级考试篇 计算牛奶重量
已知一头奶牛每天可以产20千克牛奶。N(N为变量)头奶牛7天可以产多少千克的牛奶？
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已知一头奶牛每天可以产20千克牛奶。N(N为变量)头奶牛7天可以产多少千克的牛奶？
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