Pythagorean theorem is a basic elementary geometric theorem. The sum of squares of two right angles of a right triangle is equal to the square of the hypotenuse. If the two right angles of a right triangle are A and B and the hypotenuse is C, then A? +b？ =c？ If a, b and c are all positive integers, (a, b and c) is called Pythagoras array.

The concept of addition, subtraction and elimination method (1) for binary linear equations: when the coefficients of an unknown number of two equations in the equations are equal or opposite, the two sides of the two equations are added or subtracted to eliminate the unknown number, thus transforming the binary linear equations into one-dimensional linear equations and finally getting the solution of the equations. This method of solving equations is called addition, subtraction and elimination, or addition and subtraction for short.

(2) Add and subtract steps to solve binary linear equations.

① Using the basic properties of the equation, the coefficient of an unknown quantity in the original equation is transformed into an equal or opposite number;

(2) Using the basic properties of the equation, add or subtract two deformation equations to eliminate an unknown number, and get a linear equation (both sides of the equation must be multiplied by the same number, and it is forbidden to multiply only one side. If the unknown coefficient is equal, it will be subtracted, and if the unknown coefficient is opposite, it will be added);

③ Solve this one-dimensional linear equation and get the unknown value;

(4) Substituting the obtained value of the unknown quantity into any equation in the original equation to obtain the value of another unknown quantity;

⑤ Simultaneous two unknowns with "{"are the solutions of equations;

⑥ Finally, check whether the result is correct (substitute into the original equations and check whether the equations satisfy left = right).

Interview process

(1) Waiting for the exam: Candidates arrive at the test center on time with the interview admission ticket and identity documents and enter the waiting room to wait for the exam.

(2) Topic selection: according to the arrangement of test sites, log in to the "interview evaluation software system", the computer extracts a group of test questions from the test bank, and the candidates choose one of them, and the system prints the test paper and test list for preparing lessons.

(3) Lesson preparation: Candidates enter the lesson preparation room with lesson preparation paper and test paper, write lesson plans (or demonstration activity plans), and prepare lessons for 20 minutes.

(4) Answering the prescribed questions: The examiner randomly selects 2 prescribed questions from the question bank, and the candidates answer for 5 minutes.

(5) Trial lecture (simulation class): Candidates give trial lectures according to the prepared teaching plan (or activity plan), 10 minutes.

(6) defense: the examiner will ask questions around the candidates' trial content and test items, and the candidates will defend for 5 minutes.

(VII) Scoring: The examiner group comprehensively scores the candidates' interview performance according to the scoring standard, fills in the interview scoring form, and submits the score through the interview evaluation system after being signed by the team leader.