$\left(5^{-1}\right)\:-\:\left(5^0\right)$

$\lim_{x\to0}\left(\frac{2^{\left(x^2\right)}}{x^{\left(\frac{5}{2}\right)}}\right)$

$\int\left(\frac{1}{x^2+8x+2}\right)dx$

$\frac{d}{dx}\left(x^2+1\right)^2\left(2x^3-5\right)^4$

$0,4\:x\:0,4$

$-6\left(7a+3b\right)+9\left(-a-4b\right)$

$-189\:_{\:-21}$