本节课题是北师大版义务教育课程标准实验教科书八年级上册第二章第二节《平方根》第一课时的内容是在七年级学习了乘方运算的基础上安排的,是学习实数的准备知识.由于实际计算中需要引入无理数,使数的范围从有理数扩充到了实数,从而完成了初中阶段数的扩展;运算方面,在乘方的基础上引入了开方运算,使代数运算得以完善。因此,本节课是有助于了解n次方根的概念,为 This topic is the Beijing Normal University compulsory education curriculum standard experiment textbook eighth grade second chapter second chapter second “square root” the first class content is in the seventh grade learning exponentiation arranged on the basis of learning real numbers Preparation of knowledge.Because of the need to introduce an irrational number in the actual calculation, the range of the number is extended from rational number to real number, thus completing the expansion of the number of junior high school stages; operation, the square root of the power, introduced the operation of algebra . Therefore, this lesson is a concept that helps to understand the n-th power root