関連ワード:  what is the function of sum in excel    what is the function of autosum in excel    what is the purpose of sum in excel    what is the purpose of sum function in excel    what is the function of sum formula in excel    what is the function of sum in ms excel    what is the function of sum if in excel    what is the purpose of sumif function in excel    what is the purpose of autosum in excel    what is the function of autosum button in excel