Tôi rất yêu thích cuốn sách này vì giúp tôi nâng cao và phát triển khả năng giải toán của mình. Theo tôi các bạn nên tham khảo cuốn sách này để mở rộng phương pháp học toán nhé.
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I like this book very much because it helps me to improve and develop my computing power. I you should refer to this book to expand the method of mathematics.