四则混合运算法则是什么

简介：In addition, Zuo Maodi was the salt transport envoy of Changlu and had outstanding political achievements. He was immediately promoted to the Minister of Household Affairs, and was appointed as the censor of Youdu. He was given Shangfang the sword and inspected the two Huaihe Rivers. He was responsible for the reform of the salt administration. However, there were corrupt officials and lawless officials. Salt merchants gather people to make trouble and obstruct the salt administration. Zuo Maodi can act easily!