$\left(2a+1\right)\left(1+2b\right)$
$-x^2-11-2a^3b^4+9y^3+8a^3b^4$
$3x^3-5x^2+x-1-2x^4-x^3+2x-4+2x^3+3x^2-7x$
$9^{-1}\cdot9^4$
$\frac{dy^2}{dx^2}+4x=1$
$3m^3+\frac{1}{5}m^2$
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