Annotation: A method of solving symmetric polynomials of two variables is presented in the article. Several of such problems have been solved. There are very hard problems among them which were included in Mathematical Olympiads.

Annotation: Based on the analysis of own and literature data 9 numerically insignificant species of reptiles were found at the territory of the autonomous republic. One of these species belongs to a group of turtles (Testudines), three of them belong to a group of lizards (Sauria) and five of them belong to a group snakes (Serpentes). Systematics, ecological and some biological peculiarities of species are reflected in the article. During the research previously registered Psammophis lineolatus has not been found and its existence at the territory of the Nakhichevan Autonomous Republic is under question.

Annotation: The article presents information on the distribution of some species of ferns at the territory of the Nakhchivan Autonomous Republic. The authors note that 10 species of plants are summed in 4 families and 7 genera which belong to ferns. In Aspleniaceae Newm. family it can be found 4 species in two genera in Pteridaceae Reichenb. There are two species in one genus. Data about the area of distribution of these species and their significance are provided in the article.

Annotation: The results of analysis of catches with stationary nets made from 2010 to 2012 in the North Absheron Gulf of the Caspian Sea have been presented. 26 species of fish belonging to 8 families (16 marine species, 10 migratory and semi-migratory species ) is registered in the catches. There are data distribution and abundance of each species for all of the families are summarized. The tendency of expansion of areals of marine species (Alosa braschnikowi kisselewitschi, A.b.sarensis) to the north is registered.

Annotation: There has been researched the temperature field in the refractory bricks of the furnace. As a result, there has been received a scheme of temperature distribution in the furnace wall in the presence of installed water – cooled caissons.

Annotation: On the territory of the State Reserve Zagatala marked about 900 species of plants. These plants are distributed according to a vertical zonation. Of the 11 species of plants (1.2%) of the algae, 45 species (5.0%) - mushrooms, 58 species (6.4%) - lichens, 49 species (5.4%) - mosses, 23 species (2.5%) - the highest spore, 5 species (0.5%) - gymnosperms, 130 species (14%) - monocots, 677 species (65.0%) - dicotyledons.

Annotation: This article provides a basic formula and question bank on non-traditional method of study of quadratic trinomials and their innovative solutions that teachers could use in teaching children. Problems are based on divisibility of polynomials to quadratic binomials.

Annotation: In this article we look some questions related to the numbers of Fibonacci, which teachers can apply in teaching of children. Aim of article is to completely research and explain numbers of Fibonacci, also to create base of original questions, which need non-simple answers. This article contains history of Fibonacci, definitions and properties of Fibonacci numbers, problems and their original answers.

Annotation: The paper presents data on the parasites of two salmonid species: Caspian salmon (Salmo trutta caspius Kessler) and rainbow trout (Salmo gairdneri Rich.) in Chaykend salmon factory. Was carried comparative analysis of the seasonal and age dynamics of salmon parasites.

Annotation: The paper dwells on the technology of gallium production and the impact of settling on the physical and chemical properties of rich liquor to be fed to the cementation stage.