(x+1)⼀(x^2+x+1)对x的不定积分怎么求?

2024-11-14 11:38:15
推荐回答(2个)
回答1:

∫(x+1)/(x^2+x+1)dx
=∫[(x+1/2)+1/2]/(x^2+x+1)dx
=1/2*∫d(x^2+x+1)/(x^2+x+1)+∫(1/2)/[(x+1/2)^2+3/4)]dx
=1/2ln(x^2+x+1)+1/√3arctan(x+1/2)/(√3/2) +c
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回答2:

∫(x+1)/(x^2+x+1)dx
=∫[(x+1/2)+1/2]/(x^2+x+1)dx
=1/2*∫d(x^2+x+1)/(x^2+x+1)+∫(1/2)/[(x+1/2)^2+3/4)]dx
=1/2ln(x^2+x+1)+1/√3arctan(x+1/2)/(√3/2) +c