微积分法分解三元二次多项式

Factorizing Ternary Quadratic Multimonial with Calculus Method

从二次曲面退化为两个平面的条件出发，导出三元二次多项式α11^＋ 2α12 x y＋ 2α13 xz ＋ α22 y^2 ＋ 2α23 yz＋ α33 z^2 ＋ 2α14 x ＋ 2α24 y ＋ 2α34 z ＋ α44的分解条件；采用微积分法来分解因式，给出了三元二次多项式一个实用的可分解判据，并由其特殊形式过渡到一般形式的因式分解．而获得三元二次多项式的一种简便的因式分解方法．

Under the condition of quadratic surface changing into two pieces of plane, fracorization conditions of α11^＋ 2α12 x y＋ 2α13 xz ＋ α22 y^2 ＋ 2α23 yz＋ α33 z^2 ＋ 2α14 x ＋ 2α24 y ＋ 2α34 z ＋ α44 are got. To fractorize special- formed ternary quadratic multimonials with calculus method,a practical and convenient fractorization method of general-formed ternary quadratic multimonials is gained.