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      <title>nhóm chíu chìu  chiu by Tran Nhat Truong (FPL TN)</title>
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      <description>nhóm 1</description>
      <language>en-us</language>
      <pubDate>2022-01-17 01:13:39 UTC</pubDate>
      <lastBuildDate>2025-12-23 22:14:05 UTC</lastBuildDate>
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         <title>Đề bài</title>
         <author>trungcdtk00007</author>
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         <pubDate>2022-01-17 01:18:01 UTC</pubDate>
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         <title>Câu 3: </title>
         <author>truongtntk00055</author>
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         <pubDate>2022-01-17 01:26:53 UTC</pubDate>
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         <title></title>
         <author>truongtntk00055</author>
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         <pubDate>2022-01-17 01:27:07 UTC</pubDate>
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         <title></title>
         <author>locnqtk00038</author>
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         <description><![CDATA[<div>Trong không gian cho hai đường thẳng Δ và l cắt nhau tại O sao cho<br>&nbsp;(ˆΔ,l)=α(0∘&lt;α&lt;90∘).<br>Cho l quay quanh Δ ta được mặt nón tròn xoay có:<br>là đường sinh.<br>Δ trục của mặt nón.<br>O=l∩Δ đỉnh của mặt nón.<br>2α: góc ở đỉnh.<br><br></div>]]></description>
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         <pubDate>2022-01-17 01:27:20 UTC</pubDate>
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         <title></title>
         <author>truongtntk00055</author>
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         <pubDate>2022-01-17 01:29:43 UTC</pubDate>
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         <title>Cho ΔOIM vuông tại I quay quanh cạnh góc vuông OI thì đường gấp khúc OIM tạo thành một hình, gọi là hình nón tròn xoay (gọi tắt là hình nón)</title>
         <author>locnqtk00038</author>
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         <pubDate>2022-01-17 01:38:37 UTC</pubDate>
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         <title>câu 2</title>
         <author>locnqtk00038</author>
         <link>https://padlet.com/truongtntk00055/p45k3t1waul7p8tn/wish/1994889673</link>
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         <pubDate>2022-01-17 01:38:48 UTC</pubDate>
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         <title></title>
         <author>truongtntk00055</author>
         <link>https://padlet.com/truongtntk00055/p45k3t1waul7p8tn/wish/1994897744</link>
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         <pubDate>2022-01-17 01:46:32 UTC</pubDate>
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         <title>Cắt mặt nón tròn xoay đỉnh O, trục Δ bởi mặt phẳng (P) sao cho (P)⊥Δ,O∉(P). Hình giới hạn bởi mặt nón, mặt phẳng (P) được gọi là hình nón.</title>
         <author>locnqtk00038</author>
         <link>https://padlet.com/truongtntk00055/p45k3t1waul7p8tn/wish/1994901655</link>
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         <pubDate>2022-01-17 01:50:00 UTC</pubDate>
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         <title>câu 1</title>
         <author>locnqtk00038</author>
         <link>https://padlet.com/truongtntk00055/p45k3t1waul7p8tn/wish/1994911361</link>
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         <pubDate>2022-01-17 01:59:09 UTC</pubDate>
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         <title>Khi quay mặt phẳng (P) quanh Δ một góc 360o thì mỗi điểm M trên đường C vạch ra một đường tròn có tâm O thuộc Δ và nằm trên mặt phẳng vuông góc với Δ . Như vậy khi quay mặt phẳng (P) quanh đường thẳng Δ thì đường C sẽ tao nên một hình được goi là mặt tròn xoay.</title>
         <author>locnqtk00038</author>
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         <pubDate>2022-01-17 01:59:13 UTC</pubDate>
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         <title></title>
         <author>locnqtk00038</author>
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         <pubDate>2022-01-17 02:01:42 UTC</pubDate>
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         <title></title>
         <author>locnqtk00038</author>
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         <pubDate>2022-01-17 02:04:37 UTC</pubDate>
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         <title></title>
         <author>locnqtk00038</author>
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         <pubDate>2022-01-17 02:05:15 UTC</pubDate>
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