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二次根式的加减运算。实质上就是合并同类二次根式,但在计算前应先化简二次根式.若对于二次根式的根念或有关的运算理解不透,则常会出现一些化简合并、运算顺序、乱用运算律等方面导致出错.现就有关的易出现的错误,下面就一些常见的错解加以剖析,以帮助同学们避免出现同样的错解.易错点一、二次根式的化简出错例1计算:(?).错解原式=(?).剖析二次根式加减时,先要化简每个二次根式,在化简(?)时,得到了(?),而(?)前面本身也有3,发生混淆,漏乘了根号外的系数3,导致出错.
Double root addition and subtraction. In essence, is the merger of the same type of secondary root, but the calculation should be simplified prior to the second root type.If the root of the quadratic root nunnery or related operations are not understood, often there will be some reduction and merging, the order of operation, arbitrary use of computing Law, etc. Now error related to the emergence of the following error on some common to be analyzed to help students avoid the same mistakes. Error-prone one, the second root of the simplified error example 1 Calculate: (?). The original solution = (?). Analysis of quadratic root addition and subtraction, we must first simplify each quadratic root, reduced (?), ) There are also 3 front, confusion, missed the root factor of 3, leading to errors.