$\left(a+5\right)^2-\left(a-5\right)^2$
$3x+1\:entre\:2x-4$
$\left(2a^2+6\right)\left(2a^2-6\right)$
$8.-7.90$
$3\left(8p+9\right)+5$
$2,01mnd-3,56mn$
$\left(2xy^2-3z^4\right)^3$
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