How to enter formula???

["mike fowler" <mfowler_11235 hotmail com>]

I know this should be a really old topic.  But somehow I just can't get it 
to work.
The manual has a example section for this, but the example isn't really 
clear and concrete.  Google doesn't produce any meaningful help either.  I'd 
like to see someone can explain a simple task like this:

  A B C D
1  2 3 4
2  4 5 6

I'd like to write a formula to calculate the sum of both row 1 and 2 and put 
the result in the D column.

Right now, all I can do is do it row by row with "=sum(A1:C1)" then 
"=sum(A2:C2)"
Can we do this as easy as in excel?

Thanks.



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