$$\frac { 1 } { 2 } - \frac { 1 } { 4 } \times \frac { 5 } { 8 } \div \frac { 2 } { 4 } + \frac { 3 } { 5 }$$
$\frac{63}{80}=0.7875$
$$\frac{1}{2}-\frac{\frac{1\times 5}{4\times 8}}{\frac{2}{4}}+\frac{3}{5}$$
$$\frac{1}{2}-\frac{\frac{5}{32}}{\frac{2}{4}}+\frac{3}{5}$$
$$\frac{1}{2}-\frac{\frac{5}{32}}{\frac{1}{2}}+\frac{3}{5}$$
$$\frac{1}{2}-\frac{5}{32}\times 2+\frac{3}{5}$$
$$\frac{1}{2}-\frac{5\times 2}{32}+\frac{3}{5}$$
$$\frac{1}{2}-\frac{10}{32}+\frac{3}{5}$$
$$\frac{1}{2}-\frac{5}{16}+\frac{3}{5}$$
$$\frac{8}{16}-\frac{5}{16}+\frac{3}{5}$$
$$\frac{8-5}{16}+\frac{3}{5}$$
$$\frac{3}{16}+\frac{3}{5}$$
$$\frac{15}{80}+\frac{48}{80}$$
$$\frac{15+48}{80}$$
$$\frac{63}{80}$$
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$\frac{3 ^ {2} \cdot 7}{2 ^ {4} \cdot 5} = 0.7875$
