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phuonganh229006
2 năm trước
Bài 3:Lớp 7A có 45 HS. Trong đó có 20% là HS Giỏi. Số HS Giỏi bằng 3/7 số HS Khá. Số còn lại là HS Trung Bình. Tính số HS mỗi loại. Bài 4: 1 lớp có 45 HS gồm 3 loại: Giỏi, Khá và Trung Bình. Số HS Giỏi chiếm 1/5 số Hs cả lớp. Số HS Trung Bình bằng 2/9 số HS còn lại. Tính số HS mỗi loại.
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