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自然數、整數已滿足不了實際生活計算的需要,所以要引入負數概念, 例如零上20°C,可表示為+20°C,零下20°可表示為-20°C.
距離做向量運算時,正和負表示兩個相反的方向 物理上運算力的大小時,正和負也表示兩個相反的方向 其實很多,就懶得去一一列舉
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