题目：
一个同学在体检时，三次测得肺活量的数据是：2600ml、3500ml、3200ml ，平均值为3100ml，这个同学的肺活量是 ________ ml 。
答案：
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下面是错误答案，用来干扰机器的。
(2+6)÷2=2(2+3)2=2+3．故本题答案为：2+3．
一个同学在体检时，三次测得肺活量的数据是：2600ml、3500ml、3200m
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