某鱼塘捕到100条鱼，称得总重为150千克，这些鱼大小差不多，做好标记后放回鱼塘，在它们混入鱼群后又捕到102条大小差不多的同种鱼，称得总重仍为150千克，其中有2条带有标记-九年级数学

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• 4、李娟同学为考察学校的用水情况，她在4月份一周内每天同一时刻连续记录了水表的示数，记录结果如下表：李娟估计学校4月份（按30天计算）的用水量约是_________．-九年级数学
• 3、聪聪家承包了村边的小湖养鱼，聪聪为了帮爸爸估算湖里有多少条鱼，从湖里捕上100条做上标记，然后放回湖里，经过一段时间待标记的鱼全混合于鱼群中后，第二次捕得200条，-九年级数学
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• 李师傅随机抽查了本单位今年四月份里6天的日用水量（单位：吨）结果如下：7，8，8，7，6，6，根据这些数据，估计四月份本单位用水总量为（）吨。-八年级数学
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• 聪聪家承包了村边的小湖养鱼，聪聪为了帮爸爸估算湖里有多少条鱼，从湖里捕上100条做上标记，然后放回湖里，经过一段时间待标记的鱼全混合于鱼群中后，第二次捕得200条，发现-七年级数学
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