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1教学目标(1)了解同类二次根式的概念,了解二次根式的加减运算法则;能对根号仅限于数的二次根式进行简单的加减运算;(2)类比整式的加减运算探究二次根式加减运算,体会“数式通性”;(3)归纳梳理六种代数基本运算,感受其中的变与不变。2教学重难点重点:二次根式的加减运算法则的建立。难点:被开方数不相同的二次根式的加减运算。
1 teaching objectives (1) understanding of the concept of the same type of secondary root to understand the principle of quadratic root addition and subtraction; root number can be limited to the number of quadratic root simple addition and subtraction operations; (2) Computation to explore the double root addition and subtraction operations, experience “Mathematical generality ”; (3) Summarize the basic operations of six algebra, feel the change and change. 2 teaching heavy and difficult point: the establishment of the second root of the addition and subtraction algorithm. Difficulties: the root is not the same number of root-type addition and subtraction operations.