如何学好平方根

• 作 者: 陈德前
• 出 处: 中学生数理化(七年级数学)(配合人教社教材)
• 发表日期: 2017年03期
• 关键词: 中考命题 二次方根 知识的基础 热点内容 请看 分类讨论 陈老师 黄冈 开平方 非负数

平方根的有关知识是学习实数知识的基础,也是中考命题的热点.下面和同学们谈谈如何学好平方根的有关知识.一、正确理解平方根的概念一般地,如果一个数的平方等于a,这个数就叫作a的平方根(或二次方根).就是说,如果x~2=a,那么x就叫作a的平方根.很明显,对于x~2=a来说,a是x的平方数,x是a的平方根,二者的意义不同,性质不同,求法也不同.平方运算与开平方运算是互逆运算.

The square root of the relevant knowledge is the basis for learning real knowledge, but also the hot topic in the test. The following students talk about how to learn the square root of the knowledge. First, the correct understanding of the concept of square root Generally, if a number of squares equal to a, the number Is called the square root (or quadratic root) of a, that is, if x ~ 2 = a, then x is called the square root of a. Obviously, for x ~ 2 = a, a is the square of x Number, x is the square root of a, the two have different meanings, different in nature and different in their method of calculation.Square operation and square root operation are reciprocal operation.