速度解题.thanks.在直角三角形ABC中,BC=6,AC=8,点D在线段AC上从C向A运动.若设CD=x,△ABD的面积为y.(1)请写出y与x的关系式;(2)当x为何值时,y有最大值,最大值是多少?此时点D在什么位置?(3)
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![速度解题.thanks.在直角三角形ABC中,BC=6,AC=8,点D在线段AC上从C向A运动.若设CD=x,△ABD的面积为y.(1)请写出y与x的关系式;(2)当x为何值时,y有最大值,最大值是多少?此时点D在什么位置?(3)](/uploads/image/z/10223333-53-3.jpg?t=%E9%80%9F%E5%BA%A6%E8%A7%A3%E9%A2%98.thanks.%E5%9C%A8%E7%9B%B4%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2ABC%E4%B8%AD%2CBC%3D6%2CAC%3D8%2C%E7%82%B9D%E5%9C%A8%E7%BA%BF%E6%AE%B5AC%E4%B8%8A%E4%BB%8EC%E5%90%91A%E8%BF%90%E5%8A%A8%EF%BC%8E%E8%8B%A5%E8%AE%BECD%3Dx%2C%E2%96%B3ABD%E7%9A%84%E9%9D%A2%E7%A7%AF%E4%B8%BAy%EF%BC%8E%EF%BC%881%EF%BC%89%E8%AF%B7%E5%86%99%E5%87%BAy%E4%B8%8Ex%E7%9A%84%E5%85%B3%E7%B3%BB%E5%BC%8F%EF%BC%9B%EF%BC%882%EF%BC%89%E5%BD%93x%E4%B8%BA%E4%BD%95%E5%80%BC%E6%97%B6%2Cy%E6%9C%89%E6%9C%80%E5%A4%A7%E5%80%BC%2C%E6%9C%80%E5%A4%A7%E5%80%BC%E6%98%AF%E5%A4%9A%E5%B0%91%3F%E6%AD%A4%E6%97%B6%E7%82%B9D%E5%9C%A8%E4%BB%80%E4%B9%88%E4%BD%8D%E7%BD%AE%3F%EF%BC%883%EF%BC%89)
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