$\left(0.2x-5xy\right)\left(0.2x+5xy\right)$
$-3^3+27$
$\frac{\left(2\sqrt{x}\right)\left(10^{2\sqrt{x}-1}\right)}{\sqrt{x}}$
$\left(10-t\right)^2$
$\int3m^2ndx$
$9x^4y^6+30x^2y^3z+25z^2$
$a+4=8$
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