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In this video, I suggest you review the entire course on the chapter of percentages. The purpose of this sequence is to remind you and explain the most important elements of the chapter: 0:00 Intro 0:36 Proportion 9:08 Evolutions 16:52 Rate of evolution 21:04 Successive evolutions 27:11 Reciprocal evolution ???? Official website: http://www.maths-et-tiques.fr Twitter: / mtiques Facebook: / mathsettiques Instagram: / yvanmonka