已知一直角三角形纸片ABC,∠ACB=90°,AC=2,BC=4.折叠该纸片,使点B落在边AC上,折痕与边BC交于点M,与边AB交于点N. (2)若折叠后,点B与点A重合,试在图③中画出大致图形,并求CM的长;
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![已知一直角三角形纸片ABC,∠ACB=90°,AC=2,BC=4.折叠该纸片,使点B落在边AC上,折痕与边BC交于点M,与边AB交于点N. (2)若折叠后,点B与点A重合,试在图③中画出大致图形,并求CM的长;](/uploads/image/z/1693114-34-4.jpg?t=%E5%B7%B2%E7%9F%A5%E4%B8%80%E7%9B%B4%E8%A7%92%E4%B8%89%E8%A7%92%E5%BD%A2%E7%BA%B8%E7%89%87ABC%2C%E2%88%A0ACB%EF%BC%9D90%C2%B0%2CAC%EF%BC%9D2%2CBC%EF%BC%9D4.%E6%8A%98%E5%8F%A0%E8%AF%A5%E7%BA%B8%E7%89%87%2C%E4%BD%BF%E7%82%B9B%E8%90%BD%E5%9C%A8%E8%BE%B9AC%E4%B8%8A%2C%E6%8A%98%E7%97%95%E4%B8%8E%E8%BE%B9BC%E4%BA%A4%E4%BA%8E%E7%82%B9M%2C%E4%B8%8E%E8%BE%B9AB%E4%BA%A4%E4%BA%8E%E7%82%B9N.%E3%80%80%EF%BC%882%EF%BC%89%E8%8B%A5%E6%8A%98%E5%8F%A0%E5%90%8E%2C%E7%82%B9B%E4%B8%8E%E7%82%B9A%E9%87%8D%E5%90%88%2C%E8%AF%95%E5%9C%A8%E5%9B%BE%E2%91%A2%E4%B8%AD%E7%94%BB%E5%87%BA%E5%A4%A7%E8%87%B4%E5%9B%BE%E5%BD%A2%2C%E5%B9%B6%E6%B1%82CM%E7%9A%84%E9%95%BF%EF%BC%9B)
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