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這種題最好是配圖輔助來做,這裡不方便就不幫你畫了.這道題如果是<0恒成立,因為f(x)開口向上,則只需計算f(2)<0和f(-2)<0同時成立,即取二者解的交集.如果是>0恒成立,則分3種情况討論.f(x)開口向上,對稱軸…
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