$$(\frac{50}{40}\times1\frac{3}{4}\div8)\}]$$
$\frac{35}{128}=0.2734375$
$$\frac{\frac{5}{4}\times \frac{1\times 4+3}{4}}{8}$$
$$\frac{\frac{5}{4}\times \frac{4+3}{4}}{8}$$
$$\frac{\frac{5}{4}\times \frac{7}{4}}{8}$$
$$\frac{\frac{5\times 7}{4\times 4}}{8}$$
$$\frac{\frac{35}{16}}{8}$$
$$\frac{35}{16\times 8}$$
$$\frac{35}{128}$$
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$\frac{5 \cdot 7}{2 ^ {7}} = 0.2734375$
