八下相似三角形题将三角形纸片(ΔABC)按如图所示的方式折叠,使点B落在AC上,记为点B’,折痕为EF.已知AB=AC=3,BC=4,若以点B’、F、C为顶点的三角形与ΔABC相似,那么BF是多少?
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![八下相似三角形题将三角形纸片(ΔABC)按如图所示的方式折叠,使点B落在AC上,记为点B’,折痕为EF.已知AB=AC=3,BC=4,若以点B’、F、C为顶点的三角形与ΔABC相似,那么BF是多少?](/uploads/image/z/12955099-67-9.jpg?t=%E5%85%AB%E4%B8%8B%E7%9B%B8%E4%BC%BC%E4%B8%89%E8%A7%92%E5%BD%A2%E9%A2%98%E5%B0%86%E4%B8%89%E8%A7%92%E5%BD%A2%E7%BA%B8%E7%89%87%EF%BC%88%CE%94ABC%EF%BC%89%E6%8C%89%E5%A6%82%E5%9B%BE%E6%89%80%E7%A4%BA%E7%9A%84%E6%96%B9%E5%BC%8F%E6%8A%98%E5%8F%A0%2C%E4%BD%BF%E7%82%B9B%E8%90%BD%E5%9C%A8AC%E4%B8%8A%2C%E8%AE%B0%E4%B8%BA%E7%82%B9B%E2%80%99%2C%E6%8A%98%E7%97%95%E4%B8%BAEF.%E5%B7%B2%E7%9F%A5AB%3DAC%3D3%2CBC%3D4%2C%E8%8B%A5%E4%BB%A5%E7%82%B9B%E2%80%99%E3%80%81F%E3%80%81C%E4%B8%BA%E9%A1%B6%E7%82%B9%E7%9A%84%E4%B8%89%E8%A7%92%E5%BD%A2%E4%B8%8E%CE%94ABC%E7%9B%B8%E4%BC%BC%2C%E9%82%A3%E4%B9%88BF%E6%98%AF%E5%A4%9A%E5%B0%91%3F)
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