$10x\:-\:8y\sqrt{\left(x^2+1\right)}=0$

$-15+13\cdot\left(6+\left(20\right)\right)+\left(-12\right)\cdot\left(-6\right)+\left(\left(15\cdot\left(-8\right)-20\right):\left(-4\right)\right)$

$n^2-16n+64$

$450-12-125+14-\left(41-30\right)-\left(7-1\right)-\left(15-14+11\right)$

$18a^2+48a-96$

$\left(-\frac{1}{3}\left(x\right)^3-4e\left(-8\right)\right)$

$0.354+0.92$