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4.8×10^3米.1、當保留n比特有效數字,若第n+1比特數位≤4就舍掉.2、當保留n比特有效數字,若第n+1比特數位≥6時,則第n比特數位進1.3、當保留n比特有效數字,若第n+1比特數位=5且後面數位為0時,則第n比特數位若為偶數時就舍掉後面的數…
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