$\left(a^2+5b^2\right)\left(a^2-5b^2\right)$
$52\:-\:\left(-52\right)\:$
$\left(4x-8\right)\left(x^2+5x+7\right)$
$\left(-2\right)-\left(-6\right)-\left(-14\right)-\left(-15\right)+2$
$-5,3b^{2}\times20,6b^{2}\times$
$\sqrt{12}x^2=2\sqrt{3}$
$v^2-10v$
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