$\frac{2-x}{4}|-1\geq0$

$2.5-4+2-12:3$

$\frac{d}{ds}\left(\left(s+2t-u\right)^4+\left(\left(s+2t-u\right)^2\left(stu^2\right)\right)\right)$

$\frac{a^{12}+250^{12}}{a^6-125^6}$

$\left(x-u\right)^2+6=x\left(yx+2\right)-m$

$\sqrt{2x^2-4x=x}$

$\left(a+b\right)^2-5\left(a+b\right)^2+4\left(a+b\right)-8\left(a+b\right)$