Suy luận để tìm ra phép toán có đáp án chính xác như mẫu và kết quả cuối cùng là bao nhiêu?
Câu đố thử thách tính nhanh
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A keen observer will easily find the correct answer to this riddle.
Based on the image, can you guess which country this is?
It's very easy to be deceived by the picture, so pay attention to the small details.
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