Substitution exclusion method
1) Direct substitution: substitute all options for verification until you get an option that meets the meaning of the question;
2) Selective substitution: according to the characteristics of numbers (parity, divisibility, mantissa, etc. ), filter first, and then substitute for exclusion.
Suitable questions: multi-digit problem, indefinite equation problem, residual problem, age problem, complex trip problem, difference-multiple ratio problem.
Eigenvalue method
1) Application: Set an unknown quantity in the question as a special value and get the answer through simple operation.
2) Applicable problems: engineering problems, travel problems, profit problems and concentration problems.
Equation method
1) Application: A method of using variables (such as x, y) to represent the unknowns in the topic, listing equations (groups) containing the unknowns according to the equivalence relation contained in the topic, and solving the application problems by solving the numerical values of the unknowns.
2) Applicable questions: trip problem, engineering problem, profit and loss problem, difference ratio problem, concentration problem, income problem, age problem, etc.
[Please refer to the test review materials of Sichuan Province in recent years to master the test-taking skills of various types of questions]