$$[(\frac{1}{4})^{4}\times(\frac{1}{4})^{3}]\times[(\frac{4}{5})^{12}:(\frac{4}{5})^{5}]$$
$\frac{1}{78125}=0.0000128$
$$\left(\frac{1}{4}\right)^{4}\times \left(\frac{1}{4}\right)^{3}\times \left(\frac{4}{5}\right)^{7}$$
$$\left(\frac{1}{4}\right)^{7}\times \left(\frac{4}{5}\right)^{7}$$
$$\frac{1}{16384}\times \left(\frac{4}{5}\right)^{7}$$
$$\frac{1}{16384}\times \frac{16384}{78125}$$
$$\frac{1\times 16384}{16384\times 78125}$$
$$\frac{1}{78125}$$
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$\frac{1}{5 ^ {7}} = 1.2799999999999998 \times 10^{-5}$
