Excel copy formul

[nuberoid]

hi all )) one more n00b question from me ))

I copy cells from one sheet to another, using

_ExcelReadSheetFromArray($oExcel, $aArray)
 _ExcelWriteSheetFromArray($oExcel, $aArray)

i read from cell that have: "=R[-1]C-R[-7]C-R[-4]C"

and waanna write same , but it writes "79056" ;(

[nuberoid]

so i found that i can write formula

_ExcelWriteFormula

but i dont know how to read formula ((((

Any one can help me ????