2.3.4.
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2.3.4.
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2.3.4.
1.原式=2∫1/(1+(√x)²)d(√x)=2arctan√x+c选D
2.原式=uv-∫vdu =uv-∫vu'dx
选A
D http://www.wolframalpha.com/input/?i=int%281%2F%28sqrt%28x%29*%281%2Bx%29%29%29 A
3.它的积分可化为b分之一的a*bxdbx的积分
换元后在积分得D