There are Math subjects that many people think are not included in the ENEM, and matrices are one of them. It is actually a less common subject, but it has been included in recent years, and you can't go wrong because they are usually easy questions. This content is studied in the 2nd year of high school. Don't forget, any content that is in the notice can be included in the ENEM. What are the matrix questions like in the ENEM? Sum of the elements of a matrix row Sum of the elements of a matrix column Multiplication of matrices Become a member of the 800 + ENEM Club Click Here: https://thyagoaraujo.com/clubedos800+... Study with me and be successful in Math. ONLINE MATHEMATICS PLATFORM: https://thyagoaraujo.com/ Solved questions from previous ENEM exams 01. (ENEM-2020) A company evaluated the five best-selling cell phones (T1, T2, T3, T4, and T5) in the last year, in the following items: camera, cost-benefit, design, battery performance, and screen, represented by I1, I2, I3, I4, and I5, respectively. The company assigned scores from 0 to 10 for each item evaluated and organized these scores in a matrix A, in which each element aij represents the score given by the company to device Ti in item Ij. The company considers that the best cell phone is the one that obtains the highest sum of the scores obtained in the five items evaluated. Based on this information, the cell phone that the company evaluated as the best is a) T1. b) T2. c) T3. d) T4. e) T5. 02. (ENEM-2019) A teacher administers tests with four multiple-choice questions to five students over the five working days of a week. The results were represented in a matrix. In this matrix, the elements in rows 1 to 5 represent the number of questions answered correctly by students Ana, Bruno, Carlos, Denis, and Érica, respectively, while columns 1 to 5 indicate the days of the week, from Monday to Friday, respectively, on which the tests were administered. The test with the highest number of correct answers was the one administered on a) Monday. b) Tuesday. c) Wednesday. d) Thursday. e) Friday. 03. (ENEM-2018) Electronic Transfer Available (TED) is a financial transaction of amounts between different banks. An economist decides to analyze the amounts sent via TEDs between five banks (1,2, 3, 4, and 5) during a month. To do this, he arranges these values ​​in a matrix A = [aij], where 1 ≤ i ≤ 5 and 1 ≤ j ≤ 5, and the element aij corresponds to the total resulting from the operations made via TED, in millions of reais, transferred from bank i to bank j during the month. Note that the elements aij = 0, since TED is a transfer between different banks. This is the matrix obtained for this analysis: Based on this information, the bank that transferred the largest amount via TED is bank a) 1. b) 2. c) 3. d) 4. e) 5. 04. (ENEM-2012) A student recorded the bimonthly grades of some of his subjects in a table. He noticed that the numerical entries in the table formed a 4x4 matrix, and that he could calculate the annual averages of these subjects using the product of matrices. All the tests had the same weight, and the table he obtained is shown below. To obtain these averages, he multiplied the matrix obtained from the table by a) b) c) d) e) --- Follow us on social media: ► PLATFORM (Website): https://thyagoaraujo.com/cursos/ ► Instagram: / escoladenumeros ► Instagram: / professorthyagoaraujo ► Instagram: / prof.raissacosta ► Instagram: / danieloliveira_qui ► Instagram: / andrefisica ► Twitter: / escoladenumeros CONTACT EMAIL: [email protected] Here on the channel you will find several free video classes in Mathematics, Chemistry, Physics and Biology for elementary and high school. SUBSCRIBE TO THE CHANNEL HERE: https://www.youtube.com/c/EscoladeNum... QUESTION LISTS: https://thyagoaraujo.com/listas-de-qu... CREATED BY MASTER PROFESSOR IN MATHEMATICS THYAGO ARAUJO FERREIRA #ENEM2022 #Mathematics #PaesUema2022