$$\int_{0}^{\infty}\left ( \frac{2x+ 1}{x^{2}}- \frac{3}{xe^{x}}- \frac{1}{x^{2}e^{x}} \right ){\rm d}x= 1{\it ?}$$
6/17/2019 normal
$$\int_{0}^{\infty}\left ( \frac{2x+ 1}{x^{2}}- \frac{3}{xe^{x}}- \frac{1}{x^{2}e^{x}} \right ){\rm d}x= 1{\it ?}$$
6/17/2019 normal
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