$4m^2+\frac{1}{9}n^2$
$\left(5x+3\right)\left(5x+7z\right)$
$\left(5y-2x\right)\cdot2+\left(3y+x\right)\left(x-3y\right)-\left(7y+3x\right)\cdot2-y\left(2y+13\right)$
$48x+24y$
$9a^x+3a^x+8a^x$
$2x+3>4$
$\lim_{x\to1}\left(x^{\frac{8}{1-x}}\right)$
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