因式分解的方法多，技巧性强，这就要求我们在解题时要根据不同的题目，进行具体分析，灵活选用因式分解的方法．例谈如下：一、多项式为二项式，如果有公因式，要先提公因式，再试用平方差公式或立方和、立方差公式。例１分解因式：（３）１６（ａ－ｂ）２－９（ａ＋ｂ）２．? There are many methods for factorization, and they are very skillful. This requires us to analyze specific problems according to different topics when we solve problems, and to use factorization methods flexibly. Examples are as follows: First, the polynomial is a binomial formula. If there is a common factor, we must first mention the common factor and then try the square difference formula or the cubic sum and cubic difference formula. Example 1 decomposition factor: (3) 16 (a-b) 2-9 (a + b) 2. ?