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

$7\cdot1-1\cdot7$

$\left(-3\right)+\left(-5\right)+\left(+4\right)+\left(-1\right)+\left(+6\right)$

$3b\cdot4a^4\cdot5a\cdot b^2$

$\lim_{x\to0}\left(\frac{1+\cos\left(x\pi\right)}{x^2-1}\right)$

$\frac{x^2-6x+28}{x^2-10x+24}$