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在进行二次根式乘法运算时,如能灵活运用平方差公式(a+b)(a-b)=a2-b2,可以化繁为简,化难为易,现以人教版义教《代数》第二册的部分习题为例,说明平方差公式在二次根式乘法中的几种运用形式。
In the case of quadratic root multiplication, if we can flexibly use the square difference formula (a+b)(ab)=a2-b2, we can simplify everything and make it difficult to do so. Examples of some exercises in the second volume illustrate several forms of application of the squared difference formula in quadratic root multiplication.