$$3\frac{3}{8}-1\frac{4}{5}$$
$\frac{63}{40}=1.575$
$$\frac{24+3}{8}-\frac{1\times 5+4}{5}$$
$$\frac{27}{8}-\frac{1\times 5+4}{5}$$
$$\frac{27}{8}-\frac{5+4}{5}$$
$$\frac{27}{8}-\frac{9}{5}$$
$$\frac{135}{40}-\frac{72}{40}$$
$$\frac{135-72}{40}$$
$$\frac{63}{40}$$
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$\frac{3 ^ {2} \cdot 7}{2 ^ {3} \cdot 5} = 1\frac{23}{40} = 1.575$
