$$\frac{ 3 }{ 4 } - \frac{ 1 }{ 2 } + \frac{ 2 }{ 1 }$$
$\frac{9}{4}=2.25$
$$\frac{3}{4}-\frac{2}{4}+\frac{2}{1}$$
$$\frac{3-2}{4}+\frac{2}{1}$$
$$\frac{1}{4}+\frac{2}{1}$$
$$\frac{1}{4}+2$$
$$\frac{1}{4}+\frac{8}{4}$$
$$\frac{1+8}{4}$$
$$\frac{9}{4}$$
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$\frac{3 ^ {2}}{2 ^ {2}} = 2\frac{1}{4} = 2.25$
