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tieuthoimo
2 năm trước
một lớp học có nền nhà là một hình chữ nhật có chu vi là 36 m , chiều dài hơn chiều rộng 2m . a. Tính diện tích của nền nhà b. người ta dùng gạch hoa hình vuông có cạnh là 40 cm để lát nền nhà . tính số viên gạch cần để lát nhà
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