セルD3には「=IF(C3>=90,"A",IF(C3>=80,"B",IF(C3>=70,"C",IF(C3>=60,"D","追試"))))」(②)という式を入力

セルD3には「=IF(C3>=90,"A",IF(C3>=80,"B",IF(C3>=70,"C",IF(C3>=60,"D","追試"))))」(②)という式を入力