$\:49x^4y^2-81w^{10}z^{14}$
$\left(\sqrt{4x}\right)^3$
$\left(-0.8x+1\right)^2$
$\left(2x^5+1\right)^4$
$0312\cdot91$
$3\cos x\cdot6x$
$3a^2;\:a=1,7$
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