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"This article through to the differential theorem of mean development history review, studied them in to be possible to lead in the condition change situation the situation, thought in might lead the condition to become an independent variable main point existence , the differential theorem of mean still established. And also the theorem of mean has carried on another kind of promotion to the tan oak west. In addition also introduced the differential theorem of mean in the proof equality and the inequality, the certificate equation root existence, asks the limit, to ask the approximate value, as well as aspect and so on research function condition should thus deepen to the differential theorem of mean understanding."

This text pass the review of the value axioms development history to differential calculus, studied them under the condition of can lead the condition change of situation, think at can lead the condition to change into from change the quantity as long a