取零法分解二元二次多项式陕西省商洛地区教研室余学在中学数学教学中，常常遇到二元二次多项式的因式分解，如在方程组求解及解析几何的求轨迹等问题中，都用到了二元二次多项式的因式分解．尽管二元二次多项式的分解有一些常用的方法，但对有些学生来说，却仍感到困难．... The zero method is used to decompose the binary quadratic polynomial. In the middle school mathematics teaching of Shangluo District, Shaanxi Province, the second factor polynomial often encounters the factorization of the binary quadratic polynomial. For example, in the equation set solving and analytical geometry trajectory seeking, etc. Both use factorization of binary quadratic polynomials. Although there are some commonly used methods for the decomposition of binary quadratic polynomials, it is still difficult for some students. ...