$\left[\left(-1\right)^{26}:\:\left(-1\right)^{19}\right]^2$
$9g\:-\:3g\:+\:g$
$\frac{\sqrt{8}-\sqrt{3}-\sqrt{5}}{\sqrt{3}-\sqrt{8}+\sqrt{5}}$
$\left(u^{-1}v^2\right)^2$
$-8\:x\:2$
$x^4+8x^2+9$
$3n^2\cdot2n$
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