已知O为△ABC内一点,D为BC中点,且OA OB OC =0 ,则 OA = BA -2 EA -2 OD . 已知O为△ABC内一点,D为BC中点,且OA OB OC =0 ,则 OA = BA -2 EA -2 OD . 发布时间:2024-07-30 17:58:16