In Guiyang, the 8th-grade mathematics curriculum primarily utilizes the "New Curriculum Edition" textbook series. This series is widely adopted across China and is known for its alignment with the national curriculum standards. The "New Curriculum Edition" textbooks are designed to foster critical thinking and problem-solving skills among students, emphasizing a more comprehensive understanding of mathematical concepts.

The choice of the "New Curriculum Edition" is based on several factors. Firstly, these textbooks are developed by the People's Education Publishing House, which is the leading publisher of educational materials in China. The publisher ensures that the content is up-to-date and reflects the latest educational reforms and standards. Secondly, the "New Curriculum Edition" is designed to be user-friendly, with clear explanations and engaging activities that cater to diverse learning styles.

Data from the Ministry of Education in China indicates that the "New Curriculum Edition" is used in approximately 80% of primary and secondary schools across the country. This widespread adoption is a testament to the effectiveness and quality of the textbooks. In Guiyang, the city's education authorities have recognized the value of these textbooks in preparing students for higher education and the workforce.

The "New Curriculum Edition" textbooks for 8th-grade mathematics cover a comprehensive range of topics, including algebra, geometry, statistics, and probability. These topics are presented in a logical sequence, allowing students to build a strong foundation in mathematics. The textbooks also incorporate real-world examples and applications, making the subject matter more relatable and engaging.

In conclusion, the "New Curriculum Edition" is the predominant textbook used in 8th-grade mathematics in Guiyang. Its widespread adoption is due to its alignment with national curriculum standards, user-friendly design, and comprehensive coverage of mathematical concepts.