一次函数y=kx+b的图像与x,y轴分别交于点A(2,0),B(0,4).若O为坐标原点,设OA,AB的中点分别为C和D.P为OB上一动点,求PC+PD的最小值,并求取得最小值时P点的坐标.
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![一次函数y=kx+b的图像与x,y轴分别交于点A(2,0),B(0,4).若O为坐标原点,设OA,AB的中点分别为C和D.P为OB上一动点,求PC+PD的最小值,并求取得最小值时P点的坐标.](/uploads/image/z/10909720-64-0.jpg?t=%E4%B8%80%E6%AC%A1%E5%87%BD%E6%95%B0y%3Dkx%2Bb%E7%9A%84%E5%9B%BE%E5%83%8F%E4%B8%8Ex%2Cy%E8%BD%B4%E5%88%86%E5%88%AB%E4%BA%A4%E4%BA%8E%E7%82%B9A%EF%BC%882%2C0%EF%BC%89%2CB%EF%BC%880%2C4%EF%BC%89.%E8%8B%A5O%E4%B8%BA%E5%9D%90%E6%A0%87%E5%8E%9F%E7%82%B9%2C%E8%AE%BEOA%2CAB%E7%9A%84%E4%B8%AD%E7%82%B9%E5%88%86%E5%88%AB%E4%B8%BAC%E5%92%8CD.P%E4%B8%BAOB%E4%B8%8A%E4%B8%80%E5%8A%A8%E7%82%B9%2C%E6%B1%82PC%2BPD%E7%9A%84%E6%9C%80%E5%B0%8F%E5%80%BC%2C%E5%B9%B6%E6%B1%82%E5%8F%96%E5%BE%97%E6%9C%80%E5%B0%8F%E5%80%BC%E6%97%B6P%E7%82%B9%E7%9A%84%E5%9D%90%E6%A0%87.)
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