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證明:∵平面α、β滿足α⊥β,α∩β=L,直線AB在平面α內,AB⊥L,∴AB⊥β,∵直線BC、DE在平面β內,且BC⊥DE,∴AB⊥DE,∵AB∩BC=B,∴DE⊥平面ABC,∵AC⊂平面ABC,∴AC⊥DE.
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