$e^{3x}\left(\sin\left(3y\right)dx+\cos\left(3y\right)dy\right)=0$

$3x+3y+12z=6$

$x^2+y^2=500$

$\lim_{x\to-\frac{3}{4}}\left(\frac{8x+3}{20x^2+7x-6}\right)$

$20\:+\:0,5xi\:+\:0,1xi\:2\:$

$5\sqrt{a}=20$

$\left(\sqrt[\frac{1}{2}]{a^{\frac{1}{2}^{\frac{1}{3}}}}\sqrt{b^{\frac{1}{4}^{\frac{1}{4}}}}\sqrt{c^{\frac{1}{3}}}\right)^3\cdot\frac{\sqrt{ab}}{\sqrt[3]{c}}$