怎樣的數(shù)叫正數(shù) 怎樣的數(shù)叫負數(shù)
怎樣的數(shù)叫正數(shù) 怎樣的數(shù)叫負數(shù)
數(shù)學(xué)人氣：965 ℃時間：2020-06-17 07:18:06
優(yōu)質(zhì)解答
正、負數(shù)的引入,有各種不同的方法.教材是由學(xué)生熟知的兩個實例：溫度與海拔高度引入的.比0℃高5攝氏度記作5℃,比0 ℃低5攝氏度,記作－5℃；比海平面高8848米,記作8848米,比海平面低155米記作－155米.由這兩個實例很...
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