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小題小做,樓上的是大體大做的方法,這裡介紹填空題做法, 根據二次函數影像,S9大於0,那麼4.5位於對稱軸稍左,S10小於0,是5. 4和5,誰更接近對稱軸呢?因為4.5在它左邊,所以對稱軸更靠近5
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