$\frac{t^2}{2-t^2}$
$\left(x^2+xy+y^2\right)\cdot4x-\left(x^4+y^4\right)\cdot\left(\:2x+y\right)$
$x^2+54x+648$
$2-78$
$340.2\cdot5$
$x^2-36>0$
$x\left(x+8\right)=800$
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