∫[(x+2)/(x^2+2x+3)]dx ∫(dx)/(1+e^x) 感激不尽!x^2+2x+3怎么等于(x+1)(x+2)啊?……
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![∫[(x+2)/(x^2+2x+3)]dx ∫(dx)/(1+e^x) 感激不尽!x^2+2x+3怎么等于(x+1)(x+2)啊?……](/uploads/image/z/2599930-10-0.jpg?t=%E2%88%AB%5B%28x%2B2%29%2F%28x%5E2%2B2x%2B3%29%5Ddx+%E2%88%AB%28dx%29%2F%281%2Be%5Ex%29+%E6%84%9F%E6%BF%80%E4%B8%8D%E5%B0%BD%21x%5E2%2B2x%2B3%E6%80%8E%E4%B9%88%E7%AD%89%E4%BA%8E%28x%2B1%29%28x%2B2%29%E5%95%8A%EF%BC%9F%E2%80%A6%E2%80%A6)
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