$$\frac{ 1 }{ \frac{ 1 }{ 2 } } + \frac{ 1 }{ \frac{ 1 }{ 2 } } + \frac{ 1 }{ 2 } \times \frac{ 1 }{ 2 }$$
$\frac{17}{4}=4.25$
$$1\times 2+\frac{1}{\frac{1}{2}}+\frac{1}{2}\times \frac{1}{2}$$
$$2+\frac{1}{\frac{1}{2}}+\frac{1}{2}\times \frac{1}{2}$$
$$2+1\times 2+\frac{1}{2}\times \frac{1}{2}$$
$$2+2+\frac{1}{2}\times \frac{1}{2}$$
$$4+\frac{1}{2}\times \frac{1}{2}$$
$$4+\frac{1\times 1}{2\times 2}$$
$$4+\frac{1}{4}$$
$$\frac{16}{4}+\frac{1}{4}$$
$$\frac{16+1}{4}$$
$$\frac{17}{4}$$
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$\frac{17}{2 ^ {2}} = 4\frac{1}{4} = 4.25$
