$\left(3x^2y-1\right)\left(3x^2y+1\right)$
$b^{-3}.3b^{-2}$
$69.89\cdot71.08$
$\frac{1}{2}x-\frac{3}{4}\ge4$
$7.85-5.27$
$\left(-31\right)\left(-4\right)$
$20+90+5133$
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