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lethoaianhkgab
2 năm trước
Để ốp một mảng tường người ta cần dùng 9 viên gạch hình vuông, mỗi viên gạch có cạnh là 10cm. Hỏi diện tích mảng tường ốp là bao nhiêu xăng ti- mét vuông?
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