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如圖所示①當A、B、C三點在平面α同側時,因為它們到平面α的距離相等,所以平面ABC‖平面α;②當△ABC中AB、AC的中點D、E都在平面α內時,因為BC‖DE,所以BC與平面α平行,故B、C兩點到平面α的距離相等,設AA1⊥…
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