Tính các tích phân sau:
a) $\int\limits_{}^{}\left ( x^{2}+3x+\frac{1}{x} \right )dx$ b)$\int\limits_{}^{}\frac{4x^{5}+3x^{4}-12}{x^{4}}dx$
c)$\int\limits_{}^{}x\left (1- x \right )^{20}dx $ d)$\int\limits_{}^{}\left ( \sqrt{x}-\frac{1}{\sqrt[]{x}} \right )^{2}dx $
|