$\left(\frac{7y}{9y^4}\right)^3$

$\left(7e^4k^7-2k^3\right)^3$

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

$\left(25+2x\right)\left(40+2x\right)=504$

$y^2+110y+3000=0$

$\frac{1}{2}ab^2-3ab^2+4ab$

$4-0,5\left(x-1\right)+0.5\left(x-1\right)\left(x-2\right)-0.1\left(x-1\right)\left(x-2\right)\left(x-3\right)$