Chapter Four(共28张PPT) Oxford English 8A Ancient numbersGreekEgyptian 希腊的; 希腊人; 希腊语埃及的;埃及人Roman Ⅰ=1 Ⅴ=5 Ⅹ=10 L=50 C= 100 D= 500 M=1000 III=3, Ⅳ=4, Ⅵ=6, ⅩⅨ=19, ⅩⅩ=20, ⅩLⅤ= MCMⅩⅩC=198045Chinese壹 贰 叁 肆 伍 陆 柒 捌 玖 拾 佰 仟 万0Who invented these numbers 2 3 4 5 6 7 8 9 Who invented “zero”Why was it a very important inventionIndian Arabian numberIt made it easier to write big numbers and to calculate30%a protractor,大小:2.24 MB
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