(u/(1+u))du怎样积分成u-ln(u+1)?

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• -∫ud[u/(1+u)]=-u^2/(1+u)+∫u/(1+u)du=-u^2/(1+u) + ∫du -∫1/(1+u)d(u+1) = -u^2/(1+u)+u-ln|u+1|+C求救!特别是第一步到第二步之间!
• (u/(1+u))du怎样积分成u-ln(u+1)?求详细步骤……
• -∫ud[u/(1+u)]=-u^2/(1+u)+∫u/(1+u)du=-u^2/(1+u) + ∫du -∫1/(1+u)d(u+1) = -u^2/(1+u)+u-ln|u+1|+C
• (u/(1+u))du怎样积分成u-ln(u+1)?
• 把德行交给你们的孩子,使人幸福的是德行儿非金钱.这是我的经验之谈 的意思
• see you lala