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# 파이썬 + - * / 연산을 할수 있는 클래스 class FourCal: def __init__(self, first, second): self.first = first self.second = second # def setdata(self,first,second): # self.first = first # self.second = second def add(self): result = self.first + self.second return result def mul(self): result = self.first * self.second return result def sub(self): result = self.first - self.second return result def div(self)..