1令√(1+x)=u,得:x=u^2-1,∴dx=2udu.∴原式=∫[(u^2-1)/u](2u)du =2∫(u^2-1)du =2∫u^2du-2∫du =(2/3)u^3-2u+C =(2/3)(1+x)√(1+x)-2√(1+x)+C2原...
1.∫x/根号下(1+x) dx 2.∫x^2e^x dx 3.∫xarctanx dx 4.∫xsin2x dx
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