$10\cdot2+20y+8$
$\lim_{x\to8}\left(x^2+4\right)$
$3\cdot3^3\cdot5\cdot2^2$
$\left(1+ax^{-1}\right)\left(a-x\right)$
$\left(12+9i\right)\left(3+i\right)$
$\int\:\frac{3}{x^2+4x+5}dx$
$\frac{\left(2x^2-7x+6\right)}{\left(2x-3\right)}$
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