d1=sum(a1:b2), d3=sum(a3:b4)+c3
I want excel to highlight (fill colour) the cells which are
included in sum formula. How can I do this?

Some time when I double click the divider of two rows (faint line between
two rows where cursor changes double headed) to autofit the height of row,
it does not change automatically the height of that row containing a
particular text. I have to manually drag it to adjust the height the row
containing text. Why it is like this?