$\frac{x^{\frac{25}{16}}}{x^4}$
$\left(x+2\right)^2-9<\left(x+1\right)^2+7$
$x^3\frac{dy}{dx}+x^2y=4x-1$
$4x^2-20x+13$
$5a^2-3b;\:a=0.5;\:b=-0.4$
$1+2-3x^2-3x^4+3x^4+3-3$
$x+5=-81$
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