几何模型: 条件:在直线l同旁的两个定点. 问题:在直线l上确定一点p,使pa+pb的值最小.方案:做点a关于直线l的对称点a’,连接a‘b交于点p,则pa+pb=a’b的值最小.模型应用:(1)如图(2),
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![几何模型: 条件:在直线l同旁的两个定点. 问题:在直线l上确定一点p,使pa+pb的值最小.方案:做点a关于直线l的对称点a’,连接a‘b交于点p,则pa+pb=a’b的值最小.模型应用:(1)如图(2),](/uploads/image/z/12254007-39-7.jpg?t=%E5%87%A0%E4%BD%95%E6%A8%A1%E5%9E%8B%EF%BC%9A+%E6%9D%A1%E4%BB%B6%EF%BC%9A%E5%9C%A8%E7%9B%B4%E7%BA%BFl%E5%90%8C%E6%97%81%E7%9A%84%E4%B8%A4%E4%B8%AA%E5%AE%9A%E7%82%B9.+%E9%97%AE%E9%A2%98%EF%BC%9A%E5%9C%A8%E7%9B%B4%E7%BA%BFl%E4%B8%8A%E7%A1%AE%E5%AE%9A%E4%B8%80%E7%82%B9p%2C%E4%BD%BFpa%EF%BC%8Bpb%E7%9A%84%E5%80%BC%E6%9C%80%E5%B0%8F.%E6%96%B9%E6%A1%88%EF%BC%9A%E5%81%9A%E7%82%B9a%E5%85%B3%E4%BA%8E%E7%9B%B4%E7%BA%BFl%E7%9A%84%E5%AF%B9%E7%A7%B0%E7%82%B9a%E2%80%99%2C%E8%BF%9E%E6%8E%A5a%E2%80%98b%E4%BA%A4%E4%BA%8E%E7%82%B9p%2C%E5%88%99pa%EF%BC%8Bpb%3Da%E2%80%99b%E7%9A%84%E5%80%BC%E6%9C%80%E5%B0%8F.%E6%A8%A1%E5%9E%8B%E5%BA%94%E7%94%A8%EF%BC%9A%EF%BC%881%EF%BC%89%E5%A6%82%E5%9B%BE%EF%BC%882%EF%BC%89%2C)
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