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Một lớp có 40 người gồm ba loại: Giỏi, khá và trung bình. Số học sinh giỏi chiếm 1/5 số học sinh cả lớp. Số học sinh trung bình bằng 3/8 số học sinh còn lại a) Tính số học sinh mỗi loại của lớp b) Tính tỷ số phần trăm của số học sinh trung bình so với học sinh cả lớp
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