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以数轴为背景,化简二次根式的题型在各类考试中不断出现.这类试题,只要能读懂数轴信息,用好大小关系,就可以轻松将二次根式化简.下面举例说明.例1已知:实数a,b在数轴上的位置如图1所示,试化简:分析根据实数与数轴的对应关系,可以得到-2a,然后根据开方运算的性质和绝对值的意义化简即可求解.
With the number of axes as the background, to simplify the secondary root problems in various exams continue to emerge.This type of test, as long as you can read the number of axis information, with the size of the relationship, you can easily simplify the second root. . Example 1 is known: the real number a, b position on the axis as shown in Figure 1, the trial simplification: analysis according to the real number and the axis of the corresponding relationship, you can get -2 a, and then according to the nature of the square root of the operation and the meaning of the absolute value of Jane can be solved.