在学习完了二次根式化简后,有的同学把a~(1/2)与(a~(1/2))~2相混淆,由于a~(1/2)与(a~(1/2))~2都是二次根式的重要内容,分清它们的区别和联系,可使同学们在计算中少出错误.一、a~(1/2)与(a~(1/2))~2的区别(1)a~(1/2)与(a~(1/2))~2的意义不同:(a~(1/2))~2表示非负数a的算术平方根的平方;而a~(1/2)表示a的平方的算术平方根. After learning the second root simplification, some students confuse a ~ (1/2) with (a ~ (1/2)) ~ 2. Since a ~ (1/2) / 2)) ~ 2 are important contents of the quadratic root, and the difference and connection between them can make the students make few mistakes in the calculation: a ~ (1/2) and (a ~ (1/2 )) ~ 2 (1) a ~ (1/2) is different from (a ~ (1/2)) ~ 2: (a ~ (1/2)) ~ 2 means the arithmetic mean square of nonnegative a And a ~ (1/2) represents the square root of the square of a.