A math problem in grade three [exactly the same problem in Hongkou District, Shanghai 20 14]No. 18.

Analysis: Find BC by Pythagorean theorem, let BD=2x, and get BF = FD = DF1= B1F1= X, then find AF 1, then find DE by similar triangles's proportional formula, and then find F 1E by Pythagorean theorem.

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