$1024r^2-625t^{10}$
$\left(x+2n\right)\left(x-2n\right)$
$f\left(x\right)=\frac{2\left(10x-x^2\right)}{\left(5-x\right)^2}$
$\sqrt{13^2}-12^2$
$1370\::\:\left(-5\right)$
$\left(5x^2+2x-3\right)+\left(7-3x+4x^2\right)$
$\left(+1\right)\cdot\left(+15\right)-\left(+7\right)\cdot\left(-2\right)$
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