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恩,你寫少了一個dx.積分符號就是一個求和符號,只不過求和的項有無窮多項.你以後還會發現曲線長度的計算公式還有很多,但都是由這一個演變而來的,以後你會遇到曲線用參數方程表示、用極座標表示、用柱座標表示、用球坐…
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