$\left(m-x\:10\right)^2$

$2\sqrt{7x}\cdot3\sqrt{14x^2}$

$1m^2+mn+mx+nx$

$\lim_{x\to1}\left(\frac{lnx}{20x-x^2}\right)$

$\left(-2^4\right)+\left(3^2\right)-\left(-4^2\right)+\left(-1^3\right)-\left(5^2\right)$

$\left(-2x^2-2y^6\right)^2$

$3-\left(-7+4\right)+\left(8-3\right)\left(-5\right)$