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新教材中“数的开方”一章涉及初中阶段最后一种数的运算 ,是“数与代数”的重要内容之一 .实数的概念和二次根式的化简和运算 ,及这些内容所渗透的数形结合思想和转化思想是后继内容学习 (如函数、一元二次方程等 )的基础 .不少同学在学习“数的开方”时感到难理解和掌握 ,解
The chapter “Preparation of Numbers” in the new textbook involves the calculation of the last number in the junior high school. It is one of the important contents of “Numbers and Algebras.” The concept of real numbers and the simplification and calculation of quadratic radicals, and the content The idea of the combination of number and shape of infiltration and the idea of transformation are the foundation for subsequent content learning (eg, functions, quadratic equations, etc.). Many students find it difficult to understand and master the solution when they study the “prescription of numbers”.