$$3\frac{3}{4}-3\times\frac{1}{2}$$
$\frac{9}{4}=2.25$
$$\frac{12+3}{4}-3\times \frac{1}{2}$$
$$\frac{15}{4}-3\times \frac{1}{2}$$
$$\frac{15}{4}-\frac{3}{2}$$
$$\frac{15}{4}-\frac{6}{4}$$
$$\frac{15-6}{4}$$
$$\frac{9}{4}$$
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$\frac{3 ^ {2}}{2 ^ {2}} = 2\frac{1}{4} = 2.25$