平方根和立方根是实数中重要内容,它涉及面广,与前面学过的知识联系不多,因此,在学习此处内容时容易出现这样或那样的错误.为纠正一些可能出现的错误,特剖析如下几例,希望同学们从中受益.一、把一个正数和它带根号后的数混淆.例1求81~(1/2)的算术平方根.错解81~(1/2)的算术平方根为9.剖析错把81和81~(1/2)二者混淆,∵81~(1/2)=9,∴81~(1/2)的算术平方根,就是9的算术平方根. Square Roots and Cube Roots are an important part of real numbers. They cover a wide range of topics and have little to do with the knowledge they have learned so it is easy to see one or the other mistakes in learning this content. To correct some possible mistakes, The following examples, I hope students benefit from it. A, a positive number and its roots after the number of confusion. Example 1 seeking 81 ~ (1/2) of the square root of arithmetic. The square root of the arithmetic is 9. Analysis error The two and the 81 and 81 ~ (1/2) confused, ∵81 ~ (1/2) = 9, ∴81 ~ (1/2) arithmetic square root, is the arithmetic square root of 9.