onelove1816

$\int_{-1}^{1}\left [ ln\left ( x+\sqrt{x^{2}+1} \right ) \right ]^{3}$

1, cho $\Delta ABC có \widehat{A} = 60. tìm M sao cho \sqrt{3}MA +MB + MC$ nhỏ nhất

$\int_{0}^{1}\frac{x^{4}-1}{x^{6}+1}$

$\int_{0}^{1}\frac{1}{x^{4}-x^{2}+1}$

a, $\left\{\begin{matrix} x^{2}+y^{2}+z^{2}=25 & & \\ x^{3}+y^{3}+z^{3}=125& & \end{matrix}\right.$

b, $\left\{\begin{matrix} x^{2}+y^{2}+z^{2}+2xy-zx-zy =3 & & \\ x^{2}y^{2}+yz-zx-2xy=-1& & \end{matrix}\right.$