关于二次函数在梯形abcd中,ab‖cd,∠a=90°,ab=6,cd=4,ad=2,现在梯形中作一内接矩形aefg,设ef的长为x,矩形的面积为y,求y与x的函数关系及自变量x的限定范围.当为何值时,面积有最大值吗?最大值是
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![关于二次函数在梯形abcd中,ab‖cd,∠a=90°,ab=6,cd=4,ad=2,现在梯形中作一内接矩形aefg,设ef的长为x,矩形的面积为y,求y与x的函数关系及自变量x的限定范围.当为何值时,面积有最大值吗?最大值是](/uploads/image/z/3166421-5-1.jpg?t=%E5%85%B3%E4%BA%8E%E4%BA%8C%E6%AC%A1%E5%87%BD%E6%95%B0%E5%9C%A8%E6%A2%AF%E5%BD%A2abcd%E4%B8%AD%2Cab%E2%80%96cd%2C%E2%88%A0a%3D90%C2%B0%2Cab%3D6%2Ccd%3D4%2Cad%3D2%2C%E7%8E%B0%E5%9C%A8%E6%A2%AF%E5%BD%A2%E4%B8%AD%E4%BD%9C%E4%B8%80%E5%86%85%E6%8E%A5%E7%9F%A9%E5%BD%A2aefg%2C%E8%AE%BEef%E7%9A%84%E9%95%BF%E4%B8%BAx%2C%E7%9F%A9%E5%BD%A2%E7%9A%84%E9%9D%A2%E7%A7%AF%E4%B8%BAy%2C%E6%B1%82y%E4%B8%8Ex%E7%9A%84%E5%87%BD%E6%95%B0%E5%85%B3%E7%B3%BB%E5%8F%8A%E8%87%AA%E5%8F%98%E9%87%8Fx%E7%9A%84%E9%99%90%E5%AE%9A%E8%8C%83%E5%9B%B4.%E5%BD%93%E4%B8%BA%E4%BD%95%E5%80%BC%E6%97%B6%EF%BC%8C%E9%9D%A2%E7%A7%AF%E6%9C%89%E6%9C%80%E5%A4%A7%E5%80%BC%E5%90%97%EF%BC%9F%E6%9C%80%E5%A4%A7%E5%80%BC%E6%98%AF)
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