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當兩個正負號相同的數或多項式無法直接比 或直接比較很麻煩時取兩個數的倒數比較 倒數大的原數小(注意必須符號相同) 如果你上小學不用管什麼正負符號 直接比如三分之四和四分之五 倒數分別是四分之三和五分之四 因為四分之三四分之五 如果你上中學看一下這裡吧
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