I study excel today.I study relative refar today. When we culculate each line,we have to count each time.
But in excel we don't need to coun each. If we put sum and use relative refer , we can count rapidly.
And if we can use absolute refer we don't need to use division in each line.It is very useful .
If I know it when I worked,it is very effective. But now I can understand for the first time I'm very glad.
