$\left(3\left(1\right)^2+18\left(1\right)+27\right)-\left(\left(1\right)^2-2\left(1\right)-3\right)$

$\frac { 12 n ^ { 2 } - 8 n } { 2 n }$

$-6x^2-7x+3$

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

$a\:a\:\:.\:a\:a-2$

$x^2-4x^2+6x-24$

$\left[\left(x+y\right)\left(x-y\right)\right]^2$