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已知OA为球O的半径,过OA的中点M且垂直于OA的平面截球面得到圆M.若圆M的面...
已知OA为球O的半径,过OA的中点M且垂直于OA的平面截球面得到圆M.若圆M的面积为3π,则球O的表面积等于
.
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