15.設O、A、B為坐標平面上不共線三點，其中向量垂直。若C、D兩點在直線AB上，滿足，且垂直，則=_______。（化為最簡分數）

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Terry Tung

私人筆記 #5013646

2023/04/12

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V. Composition (30%)Since its outbreak, COVID-19 has significantly changed our society, economies, and health care systems throughout the world. In the midst of extraordinary challenges and uncertainty posed by the pandemic, son me people believe that there must be a silver lining. Please write an essay within 600 words to discuss the challenges and opportunities in the post-Covid-19 era.

15.設O、A、B為坐標平面上不共線三點，其中向量垂直。若C、D兩點在直線AB上，滿足，且垂直，則=_______。（化為最簡分數）

私人筆記 (共 1 筆)

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