$6\left(712\right)$

$x\left(a+1\right)+y\left(a+1\right)$

$\int\left(\frac{9}{x\left(x+3\right)^2}\right)dx$

$\left(8-\left(4-2\right)-\left(7-9\right)\right)\cdot9$

$\left(1\right)\left(3\right)\left(-4\right)\left(2\right)$

$\frac{d}{dx}\left(1-\frac{y^3}{x^2}\right)$

$120^2$