990 resultados para Combinações (Matematica)


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Humans, as well as some animals are born gifted with the ability to perceive quantities. The needs that came from the evolution of societies and technological resources make the the optimization of such counting methods necessary. Although necessary and useful, there are a lot of diculties in the teaching of such methods.In order to broaden the range of available tools to teach Combinatorial Analysis, a owchart is presented in this work with the goal of helping the students to x the initial concepts of such subject via pratical exercises

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Generally, arithmetic and geometric progressions are taught separately from ane and exponential functions, only by the use of memorized formulas and without any concern of showing students how these contents are related. This paper aims at presenting a way of teaching such contents in an integrated way, starting with the definition of ane and exponential functions relating them to situations from the daily life of the students. Then, characteristics and graphics of those functions are presented and, subsequently, arithmetic and geometric progression are shown as a restriction of the ane and exponential functions. Thus, the study of the progressions is introduced based on the functions mentioned above using situations from students daily lives as examples

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Across the centuries, Mathematics - exact science as it is - has become a determining role in the life of man, which forms to use suprir needs of their daily lives. With this trajectory, is characterized the importance of science as an instrument of recovery not only conteudstica, but also a mathematician to know that leads the apprentice to be a dynamic process of learning ecient, able to find solutions to their real problems. However, it is necessary to understand that mathematical knowledge today requires a new view of those who deal directly with the teaching-learning process, as it is for them - Teachers of Mathematics - desmistificarem the version that mathematics, worked in the classroom, causes difficulties for the understanding of students. On this view, we tried to find this work a methodology that helps students better understand the Quadratic functions and its applications in daily life. Making use of knowledge Ethnomathematics, contextualizing the problems relating to the content and at the same time handling the software GeoGebra, aiming a better view of the behavior of graphs of functions cited

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Coordenação de Aperfeiçoamento de Pessoal de Nível Superior

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This thesis aims to show teachers and students in teaching and learning in a study of Probability High School, a subject that sharpens the perception and understanding of the phenomea of the random nature that surrounds us. The same aims do with people who are involved in this process understand basic ideas of probability and, when necessary, apply them in the real world. We seek to draw a matched between intuition and rigor and hope therebyto contribute to the work of the teacher in the classroom and the learning process of students, consolidating, deepening and expaning what they have learned in previous contents

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In this work we present a proposal to contribute to the teaching and learning of affine function in the first year of high school having as prerequisite mathematical knowledge of basic education. The proposal focuses on some properties, special cases and applications of affine functions in order to show the importance of the demonstrations while awaken student interest by showing how this function is important to solve everyday problems

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The aim of this work is to provide a text to support interested in the main systems of amortization of the current market: Constant Amortization System (SAC) and French System, also known as Table Price. We will use spreadsheets to facilitate calculations involving handling exponential and decimal. Based on [12], we show that the parcels of the SAC become smaller than the French system after a certain period. Further then that, we did a comparison to show that the total amount paid by SAC is less than the French System

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Among several theorems which are taught in basic education some of them can be proved in the classroom and others do not, because the degree of difficulty of its formal proof. A classic example is the Fundamental Theorem of Algebra which is not proved, it is necessary higher-level knowledge in mathematics. In this paper, we justify the validity of this theorem intuitively using the software Geogebra. And, based on [2] we will present a clear formal proof of this theorem that is addressed to school teachers and undergraduate students in mathematics

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In this dissertation, we present a study on the teaching of volume of the sphere and the area of spherical surface. On this topic, a quali-quantitative was taken survey with the objective of identifying how these topics are addressed. For this, we made 14 questions to 30 teachers of Natal and the results of this survey are presented and discussed. After that, we present alternative ways to derive the formulas of the volume of a sphere and the are of a spherical surface

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In this paper we analyze the Euler Relation generally using as a means to visualize the fundamental idea presented manipulation of concrete materials, so that there is greater ease of understanding of the content, expanding learning for secondary students and even fundamental. The study is an introduction to the topic and leads the reader to understand that the notorious Euler Relation if inadequately presented, is not sufficient to establish the existence of a polyhedron. For analyzing some examples, the text inserts the idea of doubt, showing cases where it is not fit enough numbers to validate the Euler Relation. The research also highlights a theorem certainly unfamiliar to many students and teachers to research the polyhedra, presenting some very simple inequalities relating the amounts of edges, vertices and faces of any convex polyhedron, which clearly specifies the conditions and sufficient necessary for us to see, without the need of viewing the existence of the solid screen. And so we can see various polyhedra and facilitate understanding of what we are exposed, we will use Geogebra, dynamic application that combines mathematical concepts of algebra and geometry and can be found through the link http://www.geogebra.org

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In this work are presented, as a review and in a historical context, the most used methods to solve quadratic equations. It is also shown the simplest type of change of variables, namely: x = Ay + B where A;B 2 R, and some changes of variables that were used to solve quadratic equations throughout history. Finally, a change of variable, which has been used by the author in the classroom as an alternative method, is presented and the result of this methodoly is illustrated by the responses of a test that was done by the students in classroom

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Um experimento foi realizado com o objetivo de avaliar o efeito do nível de energia da dieta sobre desempenho, rendimento de carcaça e porcentagem de gordura abdominal de frangos de corte. Foram utilizados 2400 pintos de um dia da linhagem Ross 308, criados em boxes até 42 dias de idade. O delineamento experimental adotado foi o inteiramente casualizado em esquema fatorial 6 x 2 (energia x sexo). Os tratamentos consistiram de combinações de seis níveis de energia (2.900, 2.960, 3.020, 3.080, 3.140 e 3.200 kcal EM/kg) e dos sexos, com quatro repetições de 50 aves cada. No período de 1 a 42 dias de idade, houve redução no consumo de ração e melhora na conversão alimentar à medida que se aumentou o nível de energia da ração. Os machos apresentaram melhores resultados de desempenho que as fêmeas, exceto para mortalidade. À medida que se acrescentou energia na dieta, houve efeito linear na porcentagem de gordura abdominal e no rendimento de asas, mas não houve efeito sobre o rendimento de carcaça e das demais partes. Os machos apresentaram maiores porcentagens de pernas e de carne de pernas e menores de carne de peito e de gordura abdominal que as fêmeas.

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O experimento foi conduzido com o objetivo de maximizar a produção e a qualidade dos ovos e minimizar a excreção de nitrogênio nas excretas de poedeiras no final do primeiro ciclo de produção, por meio do fornecimento de aporte adequado de proteína bruta (PB) e aminoácidos sulfurados totais (AAST) na dieta. Foram utilizadas 432 poedeiras Isa Brown, com 52 semanas de idade, distribuídas em delineamento inteiramente casualizado, em esquema fatorial 3 x 3 (PB e AAST) e nove tratamentos (14 e 0,57; 14 e 0,64; 14 e 0,71; 15,5 e 0,57; 15,5 e 0,64; 15,5 e 0,71; 17 e 0,57; 17 e 0,64; 17 e 0,71 % de PB e AAST, respectivamente), com seis repetições de oito aves cada. A duração do experimento foi de 140 dias. Foram avaliadas as características de desempenho, qualidade dos ovos e excreção de nitrogênio nas excretas. A única característica de desempenho influenciada pelos tratamentos foi o peso dos ovos, que apresentou os maiores valores para as combinações de 15,5 e 0,71; 17 e 0,71; 15,5 e 0,64; 14 e 0,71 e 17 e 0,64% de PB e AAST, respectivamente. Não foram observadas diferenças significativas para consumo de ração, porcentagem de postura e de ovos quebrados, massa de ovos, conversão alimentar por dúzia e por massa de ovos e mortalidade. Para os parâmetros de qualidade dos ovos, foram observadas diferenças significativas apenas para as porcentagens de gema e de albúmem. A excreção de nitrogênio foi maior nas aves alimentadas com as rações contendo 17% de PB. Pode-se sugerir que a ração contendo 14% de PB e 0,57% de AAST pode ser utilizada, sem prejuízos no desempenho e na qualidade dos ovos, e ainda contribui para a redução da excreção de nitrogênio no ambiente e do custo da ração.

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Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)

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O objetivo deste trabalho foi avaliar o efeito da utilização de óleo de linhaça, em substituição ao óleo de soja, sobre a produtividade e a qualidade da carne de frangos de corte de ambos os sexos. Foram utilizadas 320 aves, em um arranjo fatorial 4x2 - quatro combinações dos períodos de fornecimento de óleo de soja e óleo de linhaça e dois sexos - e quatro repetições. O desempenho produtivo foi avaliado por pesagens da ração e das aves com 1, 21, 42 dias e no momento do abate, aos 49 dias de idade. Após o abate, foi avaliado o rendimento de carcaça e sua composição: cortes, vísceras e gordura abdominal. Foram determinados os teores de lipídeos totais, umidade e colesterol da carne. A dieta contendo óleo de linhaça melhorou a qualidade nutricional da fração lipídica da carne de frango, mas prejudicou o desempenho produtivo das aves.