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https://math4fun.com.br/ Free exercise lists for each class: https://drive.google.com/file/d/1iiOT... START: 00:00 CLASS 1 Addition and subtraction of rational numbers 02:48 CLASS 2 Multiplication of rational numbers 13:25 CLASS 3 Division of rational numbers 21:00 CLASS 4 Introduction to first-degree equations 27:52 CLASS 5 Equations with equivalence principles 34:28 CLASS 6 Solving first-degree equations 45:11 CLASS 7 Equations with fractions 52:51 CLASS 8 Interpreting problems with equations 01:01:00 CLASS 9 Simple rule of three 01:13:35 CLASS 10 Compound rule of three 01:29:23 CLASS 11 Percentage part 1 01:33:00 CLASS 12 Percentage part 2 01:43:25 CLASS 13 Systems of equations 101:50:00 CLASS 14 Systems of equations 201:57:00 CLASS 15 Problems with systems of equations 02:06:08 CLASS 16 Introduction to second-degree equations 02:15:05 CLASS 17 Second-degree equations with Bhaskara 02:25:04 CLASS 18 Incomplete second-degree equations 02:36:40 CLASS 19 Second-degree equations Sum and Product 02:43:25 CLASS 20 Introduction to functions 02:50:15 CLASS 21 Function definition 02:56:00 CLASS 22 First-degree functions 03:00:00 CLASS 23 Graph of first-degree functions 03:13:45 CLASS 24 Writing the function from the graph 03:23:50 CLASS 25 Introduction to second-degree functions 03:29:50 CLASS 26 Zeros of the second-degree function 03:38:46 CLASS 27 Vertex of the parabola 03:47:00 CLASS 28 Maxima and minima of a quadratic function 03:52:25