$-3xy^221xy^315xy^2$
$26\cdot32\cdot21$
$7\sqrt{7}\cdot2$
$x^2-3x-270=0$
$\sqrt{\sqrt[3]{\left(a^8b^4\right)}}$
$890.45-304.256$
$x^4-7x^3-2x^2+69x-45$
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