$$\frac{1}{2}\times\frac{5}{2}-(5-4)=$$
$\frac{1}{4}=0.25$
$$\frac{1\times 5}{2\times 2}-\left(5-4\right)$$
$$\frac{5}{4}-\left(5-4\right)$$
$$\frac{5}{4}-1$$
$$\frac{5}{4}-\frac{4}{4}$$
$$\frac{5-4}{4}$$
$$\frac{1}{4}$$
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$\frac{1}{2 ^ {2}} = 0.25$
