Common equivalence relation:
1, subtraction equivalence relation:
(1) minus = minus+difference
(2) Difference = minus-minus
(3) Negative = negative difference
2. Addition equivalence relation:
(1) addend = and- another addend
(2) Sum = Addendum+Addendum
3. Multiplication equivalence relation:
(1) product = factor × factor
(2) factor = product ÷ another factor
(3) unit price × quantity = total price
(4) Speed × Time = Distance
(5) Work efficiency × working hours = total workload.
Extended data
The method of finding equivalence relation:
First, find out the equivalence relation according to the commonly used calculation formula:
Commonly used quantitative relationship: rectangular area = length × width; The equivalence relation can be found according to the calculation formula. For example, "the area of a rectangle is 19 square meter, its length is 4 meters, so how many meters is its width?" According to the calculation formula of rectangular area "length× width = area", Equation 4 = 19 can be listed.
Second, master mathematical terms and look for equivalence:
Common quantitative relationship: general sum-difference relationship or multiple relationship, which is often expressed by terms such as "one * * * has", "greater than …………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… When solving problems, you can find the equivalence relation by grasping these terms, and list the equations in narrative order.
Third, find the equivalence relation according to the common quantitative relation:
Common quantitative relationship: working efficiency × working time = total workload; Unit price × quantity = total price; Speed × time = distance ... When solving problems, we can find equivalence relations according to these quantitative relations.
Extended data source: Baidu Encyclopedia-equivalence relation