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dothu.tk1
2 năm trước
lớp 5B có 40 học sinh . số học sinh giỏi chiếm 25 % số học sinh cả lớp , số học sinh trung bình chiếm 10% số học sinh cả lớp , còn lại là học sinh khá . hỏi lớp 5B có tất cả bao nhiêu học sinh xếp loại khá
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