$16y^2+4y^2-8$
$64\cdot8$
$\frac{x^{15}-y^{15}}{y+x}$
$\left(\frac{1}{2}m-\frac{2}{5}n\right).\left(\frac{1}{4}-\frac{2}{5}n\right)$
$-2x^2yz+2xy^2$
$5x^3-45y^2$
$-7-6+8\cdot\left(+4\right)-5$
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