$\frac{6ab^{-4}}{2a^{-2}b^2}$
$5^{3\left(-2\right)}$
$\int ( x - 2 ) ^ { 2 } d x$
$\frac{n^2-16}{n+2}$
$x^3-3x^2+1\cdot x^2$
$2x\cdot x-6$
$\frac{\frac{1}{2}-\frac{y}{x}}{\frac{1}{2}+\frac{2}{x}}$
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