试题与答案

北京奥组委和国际奥委会在新闻发布上说:“中国有8亿4千万(840 000 000

题型:选择题

题目:

北京奥组委和国际奥委会在新闻发布上说:“中国有8亿4千万(840 000 000)人观看了奥运会开幕式,这确实是一个令人惊讶的数字.”840 000 000这个数字用科学记数法可表示为(  )

A.0.84×109

B.8.4×109

C.84×107

D.8.4×108

答案:

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