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當x滿足-----什麼條件時,函數值y≤0? 其實就是解不等式-x2+2x+3≤0 當x滿足x≥2時,則函數y的範圍是----? y=-x2+2x+3是個開口向下的二次函數對稱軸x=1所以當x滿足x≥2時…顯然x=2是最大值點吧
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