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trangthulhk53
2 năm trước
kết quả kiểm tra môn Toán của lớp 5B được xếp thành 3 loại: giỏi, khá và trung bình. tỉ số học sinh giỏi so với học sinh khá là 1/3, tỉ số học sinh khá so với trung bình là 2/5. hỏi bao nhiêu học sinh được xếp loại giỏi?
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