1) Tính I=\int\limits_{0}^{\sqrt{3}}\frac{x^5+2x^3}{\sqrt{x^2+1}}dx2) I=\int\limits_{\frac{-1}{2}}^{3}\frac{xdx}{\sqrt[3]{2x+2}}dx3)I=\int\limits_{0}^{1}\frac{1+x^4}{1+x^6}dx4)I=\int\limits_{1}^{3}\frac{x^2-1}{(x^2-x+1)(x^2+3x+1)}dx5)I=\int\limits_{0}^{\frac{\pi }{2}}(e^{\sin x}+cosx)cosxdx6)I=\int\limits_{0}^{1}\frac{(x^2+x+1)e^x-1}{(x+1)(xe^x+1)}dx