数学百题之七：均分田地问题：有一块等腰梯形菜地（如下图），地边有一口水井。现在3 户种菜专业户都提出要承包这块地。经研究，决定让这3 户共同承包这块地，因此必须把这块地分成面积相等、形状相同且与这口水井的距离也要相等的3 块地。你能帮助解决这个问题吗？

分析与解：分法如下图所示。我们只要把等腰梯形上底的两个端点，分别与水井连接，这样就把这块菜地分成符合题意的3块了。

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