$$1 \frac{ 3 }{ 4 } +2 \frac{ 1 }{ 2 } - \frac{ 7 }{ 8 }$$
$\frac{27}{8}=3.375$
$$\frac{4+3}{4}+\frac{2\times 2+1}{2}-\frac{7}{8}$$
$$\frac{7}{4}+\frac{2\times 2+1}{2}-\frac{7}{8}$$
$$\frac{7}{4}+\frac{4+1}{2}-\frac{7}{8}$$
$$\frac{7}{4}+\frac{5}{2}-\frac{7}{8}$$
$$\frac{7}{4}+\frac{10}{4}-\frac{7}{8}$$
$$\frac{7+10}{4}-\frac{7}{8}$$
$$\frac{17}{4}-\frac{7}{8}$$
$$\frac{34}{8}-\frac{7}{8}$$
$$\frac{34-7}{8}$$
$$\frac{27}{8}$$
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$\frac{3 ^ {3}}{2 ^ {3}} = 3\frac{3}{8} = 3.375$
