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人們在生活中經常會遇到各種相反意義的量.比如,在記帳時有餘有虧,在計算糧倉存米時,有時要記進糧食,有時要記出糧食.自然數、整數已滿足不了實際生活計算的需要,為了方便,人們就考慮了用相反意義的數來表示.
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