直线AB上,点P在A、B两点之间,点M为线段PB的中点,点N为线段AP的中点,若AB=m,且m使关于x的方程mx+4=2(x+m)有无数个解.(1)求线段AB的长(2)试说明线段MN的长为点P在线段AB上的位置无关(3)若C点
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![直线AB上,点P在A、B两点之间,点M为线段PB的中点,点N为线段AP的中点,若AB=m,且m使关于x的方程mx+4=2(x+m)有无数个解.(1)求线段AB的长(2)试说明线段MN的长为点P在线段AB上的位置无关(3)若C点](/uploads/image/z/3531611-11-1.jpg?t=%E7%9B%B4%E7%BA%BFAB%E4%B8%8A%2C%E7%82%B9P%E5%9C%A8A%E3%80%81B%E4%B8%A4%E7%82%B9%E4%B9%8B%E9%97%B4%2C%E7%82%B9M%E4%B8%BA%E7%BA%BF%E6%AE%B5PB%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E7%82%B9N%E4%B8%BA%E7%BA%BF%E6%AE%B5AP%E7%9A%84%E4%B8%AD%E7%82%B9%2C%E8%8B%A5AB%3Dm%2C%E4%B8%94m%E4%BD%BF%E5%85%B3%E4%BA%8Ex%E7%9A%84%E6%96%B9%E7%A8%8Bmx%2B4%3D2%28x%2Bm%29%E6%9C%89%E6%97%A0%E6%95%B0%E4%B8%AA%E8%A7%A3.%EF%BC%881%EF%BC%89%E6%B1%82%E7%BA%BF%E6%AE%B5AB%E7%9A%84%E9%95%BF%EF%BC%882%EF%BC%89%E8%AF%95%E8%AF%B4%E6%98%8E%E7%BA%BF%E6%AE%B5MN%E7%9A%84%E9%95%BF%E4%B8%BA%E7%82%B9P%E5%9C%A8%E7%BA%BF%E6%AE%B5AB%E4%B8%8A%E7%9A%84%E4%BD%8D%E7%BD%AE%E6%97%A0%E5%85%B3%EF%BC%883%EF%BC%89%E8%8B%A5C%E7%82%B9)
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