How to review simple equations in the first volume of fifth grade mathematics

1, review the steps of solving the equation, which is the basic process.

2. Finding the equivalence relation is the most important.

3. The results after solving need not be written in units.

1. Downstream speed = still water speed+current speed.

2. Upstream speed = still water speed-water flow speed

3. (downstream speed+upstream speed) /2= still water speed

4. (downstream speed-upstream speed) /2= current speed

5. (surplus+deficit)/twice distribution difference = quantity

6. (big profit-small profit)/twice distribution difference = quantity

7. (big loss-small loss)/twice distribution difference = quantity

8. Sum of arithmetic progression = (first item+last item) * number of items /2.

9. Number of projects = (last project-first project)/tolerance+1

10. Total amount of work = working time * working efficiency

1 1. Working hours = total amount of work/working efficiency

12. Work efficiency = total workload/working time

13. Speed * time = distance

14. Distance/speed = time

15. Distance/time = speed

16. Large number = (sum+difference) /2

17.Decimal = (sum difference) /2

These are all very useful