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신경써서 구현한 부분
SelectorAll
여러개 버튼을 한 번에 일괄 이벤트 등록하여 반복문으로 이벤트 한 번만 처리
객체 생성
객체를 생성해 formula와 resultNum을 한 쌍으로 묶어 historyList에 추가한 후, updateHistory()로 화면에 반영하게하였습니다
계산함수
질문