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歡迎您訪問數學考題練習:據統計,今年“五一”黃金周來韶關旅游的游客人數!

數學考題練習:據統計,今年“五一”黃金周來韶關旅游的游客人數

更新時間:2024-01-12 16:38:32作者:貝語網校

據統計,今年“五•一”黃金周來韶關旅游的游客人數為476 000人.用科學記數法表示游客人數,正確的是

A.476×103

B.47.6×104

C.4.76×105

D.0.476×106

試題答案

C

試題解析

確定a×10n(1≤|a|<10,n為整數)中n的值是易錯點,由于476 000有6位,所以可以確定n=6-1=5.

解答:476 000=4.76×105

故選C.

點評:把一個數M記成a×10n(1≤|a|<10,n為整數)的形式,這種記數的方法叫做科學記數法.規律:

(1)當|a|≥1時,n的值為a的整數位數減1;

(2)當|a|<1時,n的值是第一個不是0的數字前0的個數,包括整數位上的0.

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