$3.77\cdot0.875$

$e^{-x}\:=0$

$f\left(x\right)=\frac{3}{5}\ln\left(x\right)$

$\frac{2^{3}\cdot5^{-7}\cdot7^{3}}{\left(-2\right)^{-4}\cdot5^{7}\cdot7^{3}}$

$20^4\cdot20^{-2}$

$-\left(-2\right)+\left(+12\right)+4-3\left(-10\right)\left(-1\right)$

$x\left(x-8\right)<0$