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解有关二次根式的化简问题时，若能灵活运用平方差公式，往往能收到事半功倍之效．请看下面几例：例1计算．［九年义务教育代数第二册197页例2（1）题］解．评注此例直接运用平方差公式迅速求解．例2计算．[九年义务教育代数第二册203页3（3）题]解评注此例将二次根式比简后，
When solving the problem of the simplification of the secondary root formula, if we can flexibly use the square difference formula, we can often get twice the result with half the effort. Please see the following examples: Example 1 calculation. [Nine-year compulsory education algebra second volume 197 pages Example 2 (1) title] solution. Commentary This example directly uses the square difference formula to quickly solve. Example 2 calculation. [Nine-year Compulsory Education Algebra 2 203 pages 3(3) questions] Commentary Note This example compares the secondary roots