This French-language mathematics textbook provides essential mathematical foundations for students in physics, chemistry, biology, and medicine. Designed within the European LMD (License-Master-Doctorat) harmonization framework, the book offers a logical continuation of basic mathematical concepts tailored for scientific disciplines. Through numerous worked examples and exercises, readers develop practical problem-solving skills in mathematical methods relevant to their field of study. The text serves as both a learning resource and practice workbook, bridging theoretical mathematics with real-world scientific applications.