$\left(12x^5-14y^3\right)\left(12x^5+14y^3\right)$

$\left(5\cdot\:\:x+4\cdot\:\:y\right)dx+\left(4\cdot\:\:x+5\cdot\:\:y\right)dy=0$

$n^2-n+2$

$z^8-2z^4+1$

$\left(9-6y\right)^2$

$\left(-8\right):\left(+4\right)-\left(+16\right):\left(-2\right)$

$\left(\frac{1}{2\cdot\sqrt{x}}+\frac{1}{2}\right)^{10}=105$