主要用来求解三对角方程组，使用追赶法的原理进行编制，其中A为主对角线下的词对角线，B为主对角线，C为主对角线上的词对角线，D为等式右边的值，代入即可计算出数值-Mainly used for solving tridiagonal equations, using the principle of law to catch up with the preparation, in which the main diagonal A dia