$4\left(3x^2-6x\right)+3\left(2x-6\right)-\left(x^2-5x-5\right)$

$\left(-m-25\right)\left(_{-m+25}\right)$

$\pi\cdot6m^2\cdot5m$

$\lim_{x\to-1}\left(\frac{6x^4+2x^3+x-3}{x+1}\right)$

$y = ( 2 + x ^ { 2 } ) ( x - y )$

$\left(2^2x^3\right)^2$

$\frac{\left(b^3-9b^2+1\right)}{\left(b-4\right)}$