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定積分是以平面圖形的面積問題引出的.如右上圖,y=f(x)為定義在[a,b〕上的函數,為求由x=a,x=b,y=0和y=f(x)所圍圖形的面積S,採用古希臘人的窮竭法,先在小範圍內以直代曲,求出S的近似值,再取極限得到所求面積…
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