∫(x3+4x2+x)/[(x+2)2(x2+x+1)]dx=________.

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问题 ∫(x3+4x2+x)/[(x+2)2(x2+x+1)]dx=________.

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答案因为(x3+4x2+x)/[(x+2)2(x2+x+1)]=1/(x+2)+2/(x+2)2-1/(x2+x+1),所以∫(x3+4x2+x)/[(x+2)2(x2+x+1)]dx=∫[1/(x+2)+2/(x+2)2-1/(x2+x+1)]dx [*]

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