...y questions 展示性问题Genuine questions 真实问题）Lower-order questions 低层次问题）Higher-order questions（高层次问题） IV Dealing with errorsDistinction between an error and a mistake cannot be self-corrected can be self-correctedWhen to ...
This paper is to discuss the higher-orderderivativeofmany-variablesabstractcompositefunction, and to put forward theeasymethod to this type of questionsthroughsubstitution.