New Post: Can't upload huge Formulas to Excel file

Hi everyone.
Need your help with problem:
I need to Insert Formulas in the cells.
Simple Formulas like =A1+A2 are uploading OK.
But such as "=(C18100%/D18)100%" don't uploading. Just empty cells.
Also as i'm from Ukraine, i need to upload formulas on my language. Example:
=(((((C17(1-(Скидка+НакопСкидка))(1-Самовывоз)))(1-ПоФакту)))(1-Скидка_Упаковка))
Attemp to upload such formula gives an error:
Fatal error: Uncaught exception 'PHPExcel_Calculation_Exception' with message 'Лист3!G17 -> Formula Error: Expecting ')'' in /var/www/zoobonus/zoobonus.ua/php_classes_2.1/Classes/PHPExcel/Cell.php:300 Stack trace: #0 /var/www/zoobonus/zoobonus.ua/php_classes_2.1/Classes/PHPExcel/Writer/Excel5/Worksheet.php(460): PHPExcel_Cell->getCalculatedValue() #1 /var/www/zoobonus/zoobonus.ua/php_classes_2.1/Classes/PHPExcel/Writer/Excel5.php(187): PHPExcel_Writer_Excel5_Worksheet->close() #2 /var/www/zoobonus/zoobonus.ua/templates/account/price_list/blank_for_all.php(75): PHPExcel_Writer_Excel5->save('/var/www/zoobon...') #3 /var/www/zoobonus/zoobonus.ua/admin/outlet_report.php(45): include('/var/www/zoobon...') #4 {main} thrown in /var/www/zoobonus/zoobonus.ua/php_classes_2.1/Classes/PHPExcel/Cell.php on line 300

How to fix this problems?