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令其等於0,把其中一個數當成已知,然後表示出兩者的關係. 比如說,解出b1=2a,b2=-3a 然後根據二次函數的整體圖形就可以知道 在這兩點為零點 兩者之間為正,兩者之外為負 還有也可以用b表示a 如果沒的其他條件的話
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