高数问题，求指教，见图！&
萝莉の挚爱629
最好利用换元法，令t=1/x
可以，但以后在运用等价代换的时候要注意，乘除时可以替换，但加减时不能替换（带有无穷小替换除外）！希望对你有所帮助，如不懂，继续追问！我会关注！
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不影响，不过却是你的警钟呀，要考研的话，数学可是必须学得学好。从你现在就的下工夫了。
不要从课本开始看来数学，挑一本合适的教材，我当初用的是陈文登，还不错，不清楚的看教材。因为带着题型来看教材才有用，否则等你慢慢看教材的话，也许都快考试了你还没看...
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