OM20190324001


H\triangle ABC的垂心, J为边BC的中点, 点M, N在边BC上, BM=CN, 且B, M, N, C四点按此次序排列. 过H且垂直HM的直线交ABE点. 过H且垂直HN的直线交ACF点. 则直线JH\perp EH.

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