1. How to find the value of algebraic expression 2? How to factorize polynomial 3? How to prove conditional identity 4? How to simply solve a system of equations 5? How to solve problems with discriminant 6? How to Solve Problems with Vieta Theorem 7? How to skillfully solve irrational number equation 8? How to solve math problem 9 with absolute value symbol? How to prove that two line segments are equal to 10? How to prove that two angles are equal to 1 1? How to prove that a line segment is not equal to an angle, how to prove that the sum of a line segment and an angle is divided by 13 times, how to solve the problem of proportional line segments, how to prove that two straight lines are parallel, how to prove that two straight lines are perpendicular to each other, how to prove a three-point connection, how to prove the proof and application of a four-point circle, and how to solve the problem of area. How to solve the area problem of combined figure 2 1? How to prove plane geometry problem 22 by indirect method? How to prove geometry problems with triangle area formula 23? How to solve geometric calculation problems 24. How to prove geometry problem 25? How to solve the problem of fixed value 26? How to solve the maximum problem? How to solve the problem? How to solve the problem. How to solve the problem? How to solve multiple-choice questions by reducing to absurdity?