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我们已经学习了多项式的因式分解．将多项式分解因式，有以下四种基本方法：１．提公因式法．这是分解因式最基本的方法．只要多项式的各项有公因式，首先把它提出来；２．运用公式法．掌握这种方法的关键是熟悉公式．这些公式都是把乘法公式反过来得到的，运用公式法即逆用乘?
We have studied the factorization of polynomials. The polynomial decomposition factors, there are the following four basic methods: 1. Public reasoning method. This is the most basic method of factoring. As long as the polynomial has a common factor, first propose it; 2. Use the formula method. The key to mastering this method is to familiarize yourself with the formula. These formulas are obtained by inverting the multiplication formula. Using the formula method is inverse multiplication.