In this article, Arabic borrowed adverbs in the work of Samad Behrangi, a well-known representative of modern Persian literature, "ماهی سیاه کوچولو" were studied and researched. After separating the Arabic adverbs from the work, their construction and structural classification was carried out.

This article shows the method of solving mathematical problems: simplifying expressions, using derivation in proof of identity and inequalities. This method is much easier than classical methods, and it is considered with the help of examples.