把二元二次非齐次多项式分解因式,通常是用待定系数法或求根公式法,但计算都比较复杂。文(1)、(2)介绍的简便分解法克服了这个困难这里我们再介绍一种简明分解法——三十字法。本法不仅可用于作因式分解,而且还可用于作简乘运算和快速编制可分解因式的二元二次非齐次多项式。 The factorization of the binary quadratic non-homogeneous polynomials is usually done using the undetermined coefficient method or the root-finding formula method, but the calculations are more complicated. The simple decomposition method introduced in (1) and (2) overcomes this difficulty. Here we introduce a concise decomposition method—the three cross method. This method can be used not only for factorization, but also for simple multiplication operations and to rapidly formulate biquadratic nonhomogeneous polynomials with factorization.