兆 = 百萬 ?

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大陸都稱 M 為兆, 詢問他們為什麼 1兆 = 1百萬, 也說不出所以然,
Google 查到這種說法源自於十進位系統, 十 百 千 万 亿 兆 京 彼此之間都差十倍, 十億為兆, 即 106
一般數學上的兆為 1012, 避免混淆, 1012用「萬億」表達.
科技上所用到的兆都指106, 如百兆網路(100M), 兆赫(MHz)等.
ref. 維基百科 - 兆 | "兆" 有多大

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