求大神进一道难题曲线C是平面内到定点A(1,0)的距离与到定直线X=-1的距离之和为3的动点P的轨迹,已知B(a,1)则PA+PB最小值_.答案用a表示
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![求大神进一道难题曲线C是平面内到定点A(1,0)的距离与到定直线X=-1的距离之和为3的动点P的轨迹,已知B(a,1)则PA+PB最小值_.答案用a表示](/uploads/image/z/11231127-63-7.jpg?t=%E6%B1%82%E5%A4%A7%E7%A5%9E%E8%BF%9B%E4%B8%80%E9%81%93%E9%9A%BE%E9%A2%98%E6%9B%B2%E7%BA%BFC%E6%98%AF%E5%B9%B3%E9%9D%A2%E5%86%85%E5%88%B0%E5%AE%9A%E7%82%B9A%281%2C0%29%E7%9A%84%E8%B7%9D%E7%A6%BB%E4%B8%8E%E5%88%B0%E5%AE%9A%E7%9B%B4%E7%BA%BFX%3D-1%E7%9A%84%E8%B7%9D%E7%A6%BB%E4%B9%8B%E5%92%8C%E4%B8%BA3%E7%9A%84%E5%8A%A8%E7%82%B9P%E7%9A%84%E8%BD%A8%E8%BF%B9%2C%E5%B7%B2%E7%9F%A5B%EF%BC%88a%2C1%EF%BC%89%E5%88%99PA%2BPB%E6%9C%80%E5%B0%8F%E5%80%BC%EF%BC%BF.%E7%AD%94%E6%A1%88%E7%94%A8a%E8%A1%A8%E7%A4%BA)
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