沿 [0, 1] m 处，力 F(x) = x e^(-x) N 所做的功。计算 W = integrate from 0 to 1 of F(x) dx 。沿 [0, 1] m 处，力 F(x) = x e^(-x) N 所做的功。计算 W = integrate from 0 to 1 of F(x) dx 。

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