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2 năm trước
Để làm một mô hình cái bút chì trang trí, người ta dùng một khối gỗ hình trụ và một khối gỗ hình nón có cùng đường kính đáy chồng khít lên nhau. Khối gỗ hình trụ có đường kính đáy là 20cm, chiều cao là 30cm. Khối gỗ hình nón có chiều cao là 15cm.
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