$4\cdot.4\cdot$
$\left(3x-5b\right)^2$
$x^2-20x+2$
$6.34+1.242+1234.01+12.90$
$\left(\sqrt{x}+\frac{1}{x^3}\right)^n$
$1.348+736+589$
$x^2-6x+12+6$
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