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zhuzhu0071228
2 năm trước
lớp 5A có 1/4 số hs là hs trung bình,số hs giỏi bằng 2/3 số hs khá và không có hs yếu kém . Biết số hs giỏi hơn số hs trung bình là 2 bạn.Tính số hs lớp 5A
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