$\left(7.006\cdot1041\right)\cdot\left(5.09\cdot1022\right)$
$a^4-25a^2+144$
$-6\left(w-4\right)$
$4mn^2;m=-3;n=2$
$a^2+\:3a^2\:+\:3a^2\:+1$
$\left(5x^2+9x\right)+3x$
$x^2-16\le0$
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