有一块正方形的草地边长为a在四个角上各栓着一只羊,绳子长a.求一只羊可以吃到草的面积;俩只羊都可以吃到草的面积;三只羊都可以吃到草的面积;四只羊都可以吃到草的面积.
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![有一块正方形的草地边长为a在四个角上各栓着一只羊,绳子长a.求一只羊可以吃到草的面积;俩只羊都可以吃到草的面积;三只羊都可以吃到草的面积;四只羊都可以吃到草的面积.](/uploads/image/z/8686528-16-8.jpg?t=%E6%9C%89%E4%B8%80%E5%9D%97%E6%AD%A3%E6%96%B9%E5%BD%A2%E7%9A%84%E8%8D%89%E5%9C%B0%E8%BE%B9%E9%95%BF%E4%B8%BAa%E5%9C%A8%E5%9B%9B%E4%B8%AA%E8%A7%92%E4%B8%8A%E5%90%84%E6%A0%93%E7%9D%80%E4%B8%80%E5%8F%AA%E7%BE%8A%2C%E7%BB%B3%E5%AD%90%E9%95%BFa.%E6%B1%82%E4%B8%80%E5%8F%AA%E7%BE%8A%E5%8F%AF%E4%BB%A5%E5%90%83%E5%88%B0%E8%8D%89%E7%9A%84%E9%9D%A2%E7%A7%AF%EF%BC%9B%E4%BF%A9%E5%8F%AA%E7%BE%8A%E9%83%BD%E5%8F%AF%E4%BB%A5%E5%90%83%E5%88%B0%E8%8D%89%E7%9A%84%E9%9D%A2%E7%A7%AF%EF%BC%9B%E4%B8%89%E5%8F%AA%E7%BE%8A%E9%83%BD%E5%8F%AF%E4%BB%A5%E5%90%83%E5%88%B0%E8%8D%89%E7%9A%84%E9%9D%A2%E7%A7%AF%EF%BC%9B%E5%9B%9B%E5%8F%AA%E7%BE%8A%E9%83%BD%E5%8F%AF%E4%BB%A5%E5%90%83%E5%88%B0%E8%8D%89%E7%9A%84%E9%9D%A2%E7%A7%AF.)
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