在△ABC中,BC=10,S△ABC=30,矩形DEFG内接于△ABC,设DE=x,矩形DEFG的面积为y.求:(1)y与x的函数关系式及定义域;(2)当x为何值时,四边形DEFG为正方形,并求正方形DEFG的面积.
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![在△ABC中,BC=10,S△ABC=30,矩形DEFG内接于△ABC,设DE=x,矩形DEFG的面积为y.求:(1)y与x的函数关系式及定义域;(2)当x为何值时,四边形DEFG为正方形,并求正方形DEFG的面积.](/uploads/image/z/5271052-4-2.jpg?t=%E5%9C%A8%E2%96%B3ABC%E4%B8%AD%2CBC%3D10%2CS%E2%96%B3ABC%3D30%2C%E7%9F%A9%E5%BD%A2DEFG%E5%86%85%E6%8E%A5%E4%BA%8E%E2%96%B3ABC%2C%E8%AE%BEDE%3Dx%2C%E7%9F%A9%E5%BD%A2DEFG%E7%9A%84%E9%9D%A2%E7%A7%AF%E4%B8%BAy.%E6%B1%82%EF%BC%9A%EF%BC%881%EF%BC%89y%E4%B8%8Ex%E7%9A%84%E5%87%BD%E6%95%B0%E5%85%B3%E7%B3%BB%E5%BC%8F%E5%8F%8A%E5%AE%9A%E4%B9%89%E5%9F%9F%EF%BC%9B%EF%BC%882%EF%BC%89%E5%BD%93x%E4%B8%BA%E4%BD%95%E5%80%BC%E6%97%B6%2C%E5%9B%9B%E8%BE%B9%E5%BD%A2DEFG%E4%B8%BA%E6%AD%A3%E6%96%B9%E5%BD%A2%2C%E5%B9%B6%E6%B1%82%E6%AD%A3%E6%96%B9%E5%BD%A2DEFG%E7%9A%84%E9%9D%A2%E7%A7%AF.)
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