$$(\frac{6.5\times10^{-6}}{4})^{\frac{2}{3}}$$
$\frac{13^{\frac{2}{3}}}{40000}\approx 0.000138219$
$$\left(\frac{6.5\times \frac{1}{1000000}}{4}\right)^{\frac{2}{3}}$$
$$\left(\frac{\frac{13}{2000000}}{4}\right)^{\frac{2}{3}}$$
$$\left(\frac{13}{2000000\times 4}\right)^{\frac{2}{3}}$$
$$\left(\frac{13}{8000000}\right)^{\frac{2}{3}}$$
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