関連ワード:  what is the purpose of sum in excel    what is the function of sum in excel    what is the use of sum in excel    what is the purpose of sum function in excel    what is the function of autosum in excel    what is the use of autosum in excel    what is the use of sum () in ms excel    what is the use of sum function in excel    what is the purpose of autosum button in excel    what is the function of sum formula in excel