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提取公因式法是因式分解的主要方法之一，其法则是：“如果一个多项式的各项含有公因式，就可以把这个公因式提出来，作为多项式的一个因式，用这个因式去除这个多项式，把所得的商作为另一个因式．”法则中所说的另一个因式，就是用公因式去除原多项式所得的商，它仍是一个多
The extraction of the common factor method is one of the main methods of factorization. The rule is: “If a polynomial contains common factors, it can be put forward as a factor of the polynomial. By removing the polynomial by factor, the resulting quotient is taken as another factor. The other factor in the rule is the quotient obtained by removing the original polynomial by the common factor. It is still more than one.