The human population is about 7,000 million people and growing steadily.How many significant digit
The human population is about 7,000 million people and growing steadily.How many significant digit
我想问的是把7000 million 写成科学计数法后，有机位有效数字！一般写成7.0x10^9 有几个有效数字？
我想问的是把7000 million 写成科学计数法后，有机位有效数字！一般写成7.0x10^9 有几个有效数字？
英语人气：506 ℃时间：2019-08-20 03:20:21
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