$$2 \frac { 1 } { 2 } - 1 \frac { 1 } { 4 }$$
$\frac{5}{4}=1.25$
$$\frac{4+1}{2}-\frac{1\times 4+1}{4}$$
$$\frac{5}{2}-\frac{1\times 4+1}{4}$$
$$\frac{5}{2}-\frac{4+1}{4}$$
$$\frac{5}{2}-\frac{5}{4}$$
$$\frac{10}{4}-\frac{5}{4}$$
$$\frac{10-5}{4}$$
$$\frac{5}{4}$$
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$\frac{5}{2 ^ {2}} = 1\frac{1}{4} = 1.25$
