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遞增區間(0,3/2)並上(3,+無窮大).第一種方法:簡單的方法是畫圖,做出它的函數圖像.注意作圖分兩步:第一步做出y=(x-3)x=x的平方-3x的影像第二步把上邊二次函數圖像在x軸下方的影像翻倒x軸上方.即可.最終影像像英…
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