一百二十五亿人的英语单词是什么?还有十二亿五千万的英语单词

12.5 billion

一百二十五亿人 = 12.5 billion people(twelve point five billion people)
或
12 billion 500 million people
(twelve billion and five hundred million people)
十二亿五千万 = 1.25 billion
(one point two five billion)
或
1 billion 250 million
(one billion and two hundred and fifty million)

一百二十五亿人 twelve point five billion people
十二亿五千万 one point two five billion