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有一类多项式，它的某些部分是整式乘积的形式，在将这类多项式分解因式时，初学者往往感到困惑．下面归纳出几种常用的方法，供参考．一、注意提取公因式例１分解因式：x(p-q)-y(p-q)+z(q－ｐ）．（《代数》第二册５１页１７．（６）题）分析将第三项改变符号，即把（ｑ－ｐ）
There is a class of polynomials, some of which are in the form of integral products. Beginners are often confused when factorizing such polynomials. The following summarizes several commonly used methods for reference. First, pay attention to the extraction of common factors in Example 1 decomposition factor: x (p-q)-y (p-q) + z (q-p). (Algebra second volume, 51 pages 17. (6) title) analysis will change the third item, that is, put (q-p)