$$5-3\frac{3}{4}$$
$\frac{5}{4}=1.25$
$$5-\frac{12+3}{4}$$
$$5-\frac{15}{4}$$
$$\frac{20}{4}-\frac{15}{4}$$
$$\frac{20-15}{4}$$
$$\frac{5}{4}$$
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$\frac{5}{2 ^ {2}} = 1\frac{1}{4} = 1.25$
