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有効数字の話ですよね?

・かけざんわりざんは有効数字の桁が両方共通の最小の桁数まで
たとえば2*3.0=6 2.0*3.0=6.0

・足し算引き算は両方共通の最小位の桁数まで
たとえば2.1+3.27=5.3 2.10+3.27=5.37

みたいになります

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