在学习二次根式时,部分同学常将(a)2与a2混为一谈,误认为(a)2=a2,其实,二者并不一样,现从以下几个方面加以辨析:1、写法不同:(a)2中平方在根号外;而(a2)中平方在根号内。2、读法不同:(a)2读作a的算术平方根的平方;a2读作a的平方的算术平方根。3、运算顺序不同:(a)2是先求a的算 When learning secondary roots, some students often confuse (a) 2 with a2, and mistakenly believe that (a) 2 = a2. In fact, the two are not the same. Now we distinguish from the following aspects: 1. Different writing methods: (a) The square of 2 is outside the root number; while the square of (a2) is within the root number. 2. Reading is different: (a) 2 is read as the square of the arithmetic square root of a; a2 is read as the square root of the square of a. 3, the operation sequence is different: (a) 2 is the first calculation of a