有关数学调和点列性质的证明问题设A、B、C、D依次在一直线上, 若下列命题中任意两个为真, 则第三个也对: ⑴A、B、C、D成调和点列; ⑵XB是∠AXC的内角平分线; ⑶XB⊥XD.这个
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![有关数学调和点列性质的证明问题设A、B、C、D依次在一直线上, 若下列命题中任意两个为真, 则第三个也对: ⑴A、B、C、D成调和点列; ⑵XB是∠AXC的内角平分线; ⑶XB⊥XD.这个](/uploads/image/z/7122840-24-0.jpg?t=%E6%9C%89%E5%85%B3%E6%95%B0%E5%AD%A6%E8%B0%83%E5%92%8C%E7%82%B9%E5%88%97%E6%80%A7%E8%B4%A8%E7%9A%84%E8%AF%81%E6%98%8E%E9%97%AE%E9%A2%98%E8%AE%BEA%E3%80%81B%E3%80%81C%E3%80%81D%E4%BE%9D%E6%AC%A1%E5%9C%A8%E4%B8%80%E7%9B%B4%E7%BA%BF%E4%B8%8A%2C+%E3%80%80%E3%80%80%E8%8B%A5%E4%B8%8B%E5%88%97%E5%91%BD%E9%A2%98%E4%B8%AD%E4%BB%BB%E6%84%8F%E4%B8%A4%E4%B8%AA%E4%B8%BA%E7%9C%9F%2C+%E5%88%99%E7%AC%AC%E4%B8%89%E4%B8%AA%E4%B9%9F%E5%AF%B9%3A+%E3%80%80%E3%80%80%E2%91%B4A%E3%80%81B%E3%80%81C%E3%80%81D%E6%88%90%E8%B0%83%E5%92%8C%E7%82%B9%E5%88%97%3B+%E3%80%80%E3%80%80%E2%91%B5XB%E6%98%AF%E2%88%A0AXC%E7%9A%84%E5%86%85%E8%A7%92%E5%B9%B3%E5%88%86%E7%BA%BF%3B+%E3%80%80%E3%80%80%E2%91%B6XB%E2%8A%A5XD.%E8%BF%99%E4%B8%AA)
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