将矩形纸片abcd沿ae方向向上折叠,使点b落在dc边上的f点处,若三角形afd的周长为9三角形ecf的周长为3 fc?
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![将矩形纸片abcd沿ae方向向上折叠,使点b落在dc边上的f点处,若三角形afd的周长为9三角形ecf的周长为3 fc?](/uploads/image/z/12420053-53-3.jpg?t=%E5%B0%86%E7%9F%A9%E5%BD%A2%E7%BA%B8%E7%89%87abcd%E6%B2%BFae%E6%96%B9%E5%90%91%E5%90%91%E4%B8%8A%E6%8A%98%E5%8F%A0%2C%E4%BD%BF%E7%82%B9b%E8%90%BD%E5%9C%A8dc%E8%BE%B9%E4%B8%8A%E7%9A%84f%E7%82%B9%E5%A4%84%2C%E8%8B%A5%E4%B8%89%E8%A7%92%E5%BD%A2afd%E7%9A%84%E5%91%A8%E9%95%BF%E4%B8%BA9%E4%B8%89%E8%A7%92%E5%BD%A2ecf%E7%9A%84%E5%91%A8%E9%95%BF%E4%B8%BA3+fc%3F)
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