$72.5\frac{1}{3}$
$\left(-1\right)^{35}\cdot\left(-1\right)^{10}$
$\left(\frac{2}{3}x^2y-\frac{1}{4}\right)\left(\frac{2}{3}x^2y+\frac{1}{4}\right)$
$81-121a^2b^2$
$\int x ^ { - 9 } d x$
$3+-6^2+\left(-2^2\right)$
$\frac{dy}{dx}=\frac{x}{8y}$
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