$\left(2x^2-5y\right)\cdot\left(4x+2y^2\right)$
$13a^2b-26ab^2$
$-2\cdot19+5$
$225f^{16}-144g^{20}$
$1+\frac{2}{3x-2}+\frac{3}{2}-\frac{13}{4x+6}$
$\frac{8x+2x+3}{4x^2+6x+1}$
$\sqrt{\frac{x^2}{4}}$
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