在数轴上和有理数a,b,c对应的点的位置如图所示,有下面四个结论:① abd﹤0 ② │a-b│+│b-c│=│a-c│③ (a-b)(b-c)(c-a)﹥0 ④ │a│<1-bc其正确的结论有几个?图:a b c─┴┴────┴┴┴┴─
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![在数轴上和有理数a,b,c对应的点的位置如图所示,有下面四个结论:① abd﹤0 ② │a-b│+│b-c│=│a-c│③ (a-b)(b-c)(c-a)﹥0 ④ │a│<1-bc其正确的结论有几个?图:a b c─┴┴────┴┴┴┴─](/uploads/image/z/1765679-23-9.jpg?t=%E5%9C%A8%E6%95%B0%E8%BD%B4%E4%B8%8A%E5%92%8C%E6%9C%89%E7%90%86%E6%95%B0a%2Cb%2Cc%E5%AF%B9%E5%BA%94%E7%9A%84%E7%82%B9%E7%9A%84%E4%BD%8D%E7%BD%AE%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%2C%E6%9C%89%E4%B8%8B%E9%9D%A2%E5%9B%9B%E4%B8%AA%E7%BB%93%E8%AE%BA%EF%BC%9A%E2%91%A0+abd%EF%B9%A40+%E2%91%A1+%E2%94%82a-b%E2%94%82%2B%E2%94%82b-c%E2%94%82%3D%E2%94%82a-c%E2%94%82%E2%91%A2+%28a-b%29%28b-c%29%28c-a%29%EF%B9%A50+%E2%91%A3+%E2%94%82a%E2%94%82%EF%BC%9C1-bc%E5%85%B6%E6%AD%A3%E7%A1%AE%E7%9A%84%E7%BB%93%E8%AE%BA%E6%9C%89%E5%87%A0%E4%B8%AA%3F%E5%9B%BE%EF%BC%9Aa+b+c%E2%94%80%E2%94%B4%E2%94%B4%E2%94%80%E2%94%80%E2%94%80%E2%94%80%E2%94%B4%E2%94%B4%E2%94%B4%E2%94%B4%E2%94%80)
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