Equivalent substitution refers to the substitution of one quantity (or part of a quantity) for another quantity (or part of another quantity) which is equal to it. The specific analysis is as follows:

Definition of equivalent substitution: substituting one quantity (or part of another quantity) for another quantity (or part of another quantity) equal to it. "Equivalent substitution" means that a quantity is replaced by an equivalent quantity, which is a basic thinking method in mathematics and the basis of algebraic thinking method.

This mathematical thinking method is not only widely used, but also the basis for further learning mathematics. This is a very important knowledge point, even in universities.

You can see the meaning of equivalent substitution from the above.

Extended data:

Equivalence means equal quantity, and substitution means substitution and substitution. Equivalent substitution means that the same amount can be interchanged. More generally, if several quantities are all equal to a certain quantity, then these quantities are equal to each other. Since it is equivalent, it limits that the object must be an equation;

Forms of equivalent substitution:

General form: if a=b and b=c, then a = c；;

Other forms: if a+b=c and a+d=c, then b=d (two quantities in the same position in the equation are equal to other quantities).

Baidu Encyclopedia-Equivalent Replacement