十进位制记数法,是大家熟悉和应用最多的一种记数法。在我国周代《易经》一书中,就有“万有一千五百二十”的记载,说明早在二千年前我国就有了十进制。公元六世纪,甄鸾在注汉末徐岳所著的《数术拾遗》的书时,就用了“万万为亿,万万亿为兆,万万兆为京”的说法。我们知道,光在真空里的传播速度为每秒钟三十万公里。三十万也就是300000,可写成3×10^5(此为网络记法,表示3乘以10的5次方)。10的右上 Decimal notation is the most common method of numbering. In the “Book of Changes” of the Zhou Dynasty in China, there was a record of “ten thousand five hundred twenty thousand”, indicating that as early as two thousand years ago, there was a decimal system in our country. In the sixth century AD, when he was reading the book “Surgical Gatherings” written by Xu Yue at the end of the Han Dynasty, he used the phrase “thousands of billions, trillions of trillions, and trillions of trillions of capitals”. We know that light travels at a speed of 300,000 kilometers per second in a vacuum. 300,000 is also 300,000, which can be written as 3×10^5 (this is the network notation, which means that 3 times 10 is the 5th power). Top 10 of 10