数学中的对偶关系是指形式相似,并具有某种对称关系一对关系式,在解题过程中,有时若能合理构造对偶关系式,并通过对这对对偶关系式进行适当的和、差、积等运算,可达到解决数学问题的目的.在解题的过程中,恰当使用对偶法,往往能使问题得到巧妙 Duality in mathematics refers to the form of a similar and has some symmetrical relationship between a pair of relations in the process of solving problems, and sometimes if we can reasonably construct duality relationship, and through the appropriate relationship between the dual and, difference , Plot and other operations, can achieve the purpose of solving mathematical problems in the process of solving problems, the proper use of dual law, often make the problem clever