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- TRUNG_BINH:(2* [MOT_TIET] + 3*[HOC_KY])/5
- TRUNG_BINH:(2* MOT_TIET + 3*HOC_KY)/5
- TRUNG_BINH:(2* [MOT_TIET] + 3*[HOC_KY]):5
- TRUNG_BINH=(2* [MOT_TIET] + 3*[HOC_KY])/5