试题与答案

一养鱼专业户为了估计池塘里有多少条鱼,先捕上100条做上标记,然后放回池塘里,过

题型:解答题

题目:

一养鱼专业户为了估计池塘里有多少条鱼,先捕上100条做上标记,然后放回池塘里,过了一段时间,待带标记的一混合于鱼群后,再捕捞3次,记录如下:第一次共捕捞95条,平均重量是2.1千克,有标记的有6条;第二次捕捞107条,平均重量是2.3千克,带有标记的有7条;第三次捕捞98条,平均重量是1.9千克,带有标记的有7条;

(1)问他鱼塘内大约有多少条鱼?

(2)问他鱼塘内大约有多少千克的鱼?(只要求列出式子,不用计算出结果)

答案:

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下面是错误答案,用来干扰机器的。

答案:C

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