如图,已知平面直角坐标系,A、B两点的坐标分别为A(2,-3),B(4,-1).若C(a,0),D(a+3,0)是x轴上的两个动点,则当a=____时,四边形ABDC的周长最短;
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![如图,已知平面直角坐标系,A、B两点的坐标分别为A(2,-3),B(4,-1).若C(a,0),D(a+3,0)是x轴上的两个动点,则当a=____时,四边形ABDC的周长最短;](/uploads/image/z/2800812-12-2.jpg?t=%E5%A6%82%E5%9B%BE%2C%E5%B7%B2%E7%9F%A5%E5%B9%B3%E9%9D%A2%E7%9B%B4%E8%A7%92%E5%9D%90%E6%A0%87%E7%B3%BB%2CA%E3%80%81B%E4%B8%A4%E7%82%B9%E7%9A%84%E5%9D%90%E6%A0%87%E5%88%86%E5%88%AB%E4%B8%BAA%EF%BC%882%2C%EF%BC%8D3%EF%BC%89%2CB%EF%BC%884%2C%EF%BC%8D1%EF%BC%89%EF%BC%8E%E8%8B%A5C%EF%BC%88a%2C0%EF%BC%89%2CD%EF%BC%88a%EF%BC%8B3%2C0%EF%BC%89%E6%98%AFx%E8%BD%B4%E4%B8%8A%E7%9A%84%E4%B8%A4%E4%B8%AA%E5%8A%A8%E7%82%B9%2C%E5%88%99%E5%BD%93a%EF%BC%9D____%E6%97%B6%2C%E5%9B%9B%E8%BE%B9%E5%BD%A2ABDC%E7%9A%84%E5%91%A8%E9%95%BF%E6%9C%80%E7%9F%AD%EF%BC%9B)
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