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Who speaks well in all chapters of the high number part of the postgraduate entrance examination, especially the proof of differential mean value theorem and definite integral? . . High score.
Zhang Yu, Zhang Yu, Zhang Yu without suspense. He summarized the mean value theorem of 1 1. I copied it myself and read it several times. I'm not afraid of this kind of problem anymore. The scope of definite integral proof is too wide, but I remember brother Yu also made a summary.

I'll give you the video link right away. Come on, Brother Yu is so fierce!