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式子y=a(x+h)²;+k通常叫做頂點式.它清楚地反映了二次函數頂點座標與引數及函數之間的關係.其中h,k分別是頂點的橫坐標和縱坐標,h的符號决定對稱軸在x軸的位置,h的絕對值决定對稱軸到y軸距離的大小;h>0,對稱…
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