数的“开方”运算是同学们学习中继“加、减、乘、除、乘方”五种运算后的又一种运算.也是初中阶段需要掌握的一种重要的运算.由于开方运算的特殊性.例如开平方运算中被开方数取值范围的限制、平方根运算结果的不唯一性等.容易导致同学们在进行开方运算时犯错误.下面针对同学们常犯的错误进行剖析.希望同学们引以为戒. The “open square” calculation of numbers is another kind of operation after the students learn the relay “add, subtract, multiply, divide, and multiply”. It is also an important operation that needs to be mastered in the junior high school stage. Due to the special nature of the open square operations, such as the limited range of the open squares in the square root calculation, the uniqueness of the square root operation result, etc. It is easy to cause the students to make mistakes when performing the open square calculation. The following is for the students. Frequent mistakes are analysed. I hope the students will take a lesson.