减去法很有特色。关于它的计算方法,与加入法相比,研究不多。目前有表格法及二参数逼近法等。本文对减去法方程组的定解与求解问题进行了研究。结果表明,它与加入法表面上只有一正一负之别,但是它们在很多方面,还是存在着较大的差别。如果不加证明地套用加入法的计算公式,有时则会出现差错。在本文定理1与2的基础上,又给出了两种解法,实测数据的计算结果表明,它们是行之有效的算法。 Subtracting the law is very distinctive. There is not much research on its calculation method compared with the accession method. At present, there are tabular method and two parameters approximation method. In this paper, we study the problem of solution and solution of the subtraction law system. The result shows that it has only one positive, one negative and one negative on the surface of the joining method, but there are still many differences between them in many aspects. If you apply the law of addition without proof, you may sometimes get an error. On the basis of theorem 1 and 2 in this paper, two solutions are given. The calculation results of measured data show that they are effective algorithms.