$$9 \frac { 3 } { 8 } - 4 \frac { 1 } { 2 } =$$
$\frac{39}{8}=4.875$
$$\frac{72+3}{8}-\frac{4\times 2+1}{2}$$
$$\frac{75}{8}-\frac{4\times 2+1}{2}$$
$$\frac{75}{8}-\frac{8+1}{2}$$
$$\frac{75}{8}-\frac{9}{2}$$
$$\frac{75}{8}-\frac{36}{8}$$
$$\frac{75-36}{8}$$
$$\frac{39}{8}$$
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$\frac{3 \cdot 13}{2 ^ {3}} = 4\frac{7}{8} = 4.875$
