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已知H是球O的直径AB上一点,AH:HB=1:2,AB⊥平面α,H为垂足,α截球...
已知H是球O的直径AB上一点,AH:HB=1:2,AB⊥平面α,H为垂足,α截球O所得截面的面积为π,则球O的表面积为 .
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