Elimination: In some complex application problems, there are two or more quantitative relationships. When solving problems, we can first express the quantitative relationship of each group with equations.

Elimination method: it refers to a method of solving problems by transforming several elements in many relationships finite times and eliminating some of them.

2. There are different ways to solve the problem.

Exclusion method: compare the two, and exclude one first.

Elimination method: the unknown number of one equation in the equation group is expressed by an algebraic expression containing another unknown number, substituted into another equation, and an unknown number is eliminated to obtain a solution.

3. Adopt different applications.

Elimination method: for the optimization problems in production and scientific research, the experimental points are reasonably arranged by using mathematical principles, so that they can quickly find the best or close to the best application.

Elimination method: guide students to produce and understand the idea of elimination, write the conditions into several equations and compare them together. If there is a quantity with the same number, it is easy to eliminate it, and actively understand and master the basis of concrete solutions such as method of substitution, addition and subtraction.

Baidu encyclopedia-exclusion method

Baidu encyclopedia-exclusion method