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4770m, expressed by scientific counting method (two significant numbers reserved)
2. When the n-th significant digit is reserved, if the n-th + 1 digit is equal to or greater than 6, then the n-th digit is further 1.3. When the n-th significant digit is reserved, if the n-th + 1 digit is 5 and the following digit is 0, then the n-th digit is even, then the following digit is discarded
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