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二次根式是在数的开方的基础上展开的,是算术平方根概念的抽象与拓展,同时又为下一章一元二次方程的学习打下基础。二次根式涉及的概念较多,是中考的重点。试题主要考查的是二次根式、最简二次根式的概念,并能熟练地化简含二次根式的式子,会进行简单的二次根式的加、减、乘、除四则运算,并经历从特殊事例归纳一般规律的过程。重点考查了二次根式的运算。
The second radical is based on the square root of the number, which is the abstraction and expansion of the concept of arithmetic square root, and at the same time it lays the foundation for the study of the quadratic equation of the next chapter. The second root involves more concepts, is the focus of the exam. Test questions mainly examine the concept of the second root, the most simple root of the second radical, and can skillfully simplify the formula with quadratic roots, will be a simple quadratic addition, subtraction, multiplication and division of the four operations and Experiencing the process of general rules from special cases. Focus on the test of the second root operation.