(3) int_(4)^9 sqrt(x)(1+sqrt(x))dx;(3) $\int_{4}^{9} \sqrt{x}(1+\sqrt{x})dx;$
(4) (int )_(1)^4dfrac (ln x)(sqrt {x)}dx
(12) int_(1)^4(dx)/(1+sqrt(x));(12) $\int_{1}^{4}\frac{dx}{1+\sqrt{x}};$
(8) (int )_(1)^4dfrac (ln x)(sqrt {x)}dx;
(8) (int )_(1)^4dfrac (ln x)(sqrt {x)}dx
int_(-4)^4(sqrt(16-{{x)^2)}dx}(=)__________$\int_{-4}^{4}{\sqrt{16-{{x}^{2}}}dx}
14.求定积分 int_(0)^4ln(2+sqrt(x))dx14.求定积分 $\int_{0}^{4}\ln(2+\sqrt{x})dx$
(d)/(dx) int_(1)^x x ln (x^2 + 1) , dx = $\frac{d}{dx} \int_{1}^{x} x \ln (x^2 +
int dfrac (1)(sqrt {x)}ln sqrt (x)dx
求不定积分int dfrac (1)(2x)sqrt (ln x)dx=（）.int dfrac (1)(2x)sqrt (ln x)dx=int dfrac