Common equivalence relation: subtraction equivalence relation. Subtraction = subtraction+difference; Difference =-minus the minuend; Subtraction = minuend-difference; Appendix = and- another addend of the addition equivalence relation. Sum = addend+addend.
Multiplicative equivalence relation. Product = factor × factor; Factor = product ÷ another factor; Division equivalence relation; Dividend = divisor × quotient; Divider = dividend quotient.
Multiple equal relations; Number of copies × number of copies = total number of copies; Total number of copies/number of copies = number of copies; Total copies/copies = copies.
Extended data:
"Equivalence relation" refers to the equal relation between quantities, which is one of the quantitative relations. Mathematical problems often contain many equivalence relations. If we need to solve the problem by equation, we need to find out the equivalence relation in the problem.
Several methods to find equivalence relation;
First, grasp the key sentences and find out the equation of equivalence relation. For example, on Sunday, my mother went out to buy some fruit and my mother bought three watermelons. The number of apples bought is more than three times that of watermelons. There are 1 watermelon. How many watermelons are there?
The key sentence of this question is: the number of apples is more than three times that of watermelon, 1, from which we can find the quantitative relationship between watermelon × 3- 1 = the number of apples. Let the number of watermelons be X, and the equation can be: 3 X-1= 3.
Secondly, according to the relevant geometric formulas, the equations are listed. For example, the height of the triangle is 5 decimeters, the area of the triangle is 50 square decimeters, and how many decimeters is the base of the triangle? According to "triangle area formula: triangle area = base × height ÷2", let the base of the triangle be decimeter x, and the equation 5 ÷ 2 = 50 can be listed.