$$(\frac{2}{3})^{5}+(\frac{2}{3})^{8}\times(\frac{2}{3})^{3}$$
$\frac{25376}{177147}\approx 0.143248263$
$$\left(\frac{2}{3}\right)^{5}+\left(\frac{2}{3}\right)^{11}$$
$$\frac{32}{243}+\left(\frac{2}{3}\right)^{11}$$
$$\frac{32}{243}+\frac{2048}{177147}$$
$$\frac{23328}{177147}+\frac{2048}{177147}$$
$$\frac{23328+2048}{177147}$$
$$\frac{25376}{177147}$$
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$\frac{2 ^ {5} \cdot 13 \cdot 61}{3 ^ {11}} = 0.1432482627422423$