$$4 \frac{ 3 }{ 8 } \div \frac{ 25 }{ 18 }$$
$\frac{63}{20}=3.15$
$$\frac{\left(4\times 8+3\right)\times 18}{8\times 25}$$
$$\frac{9\left(3+4\times 8\right)}{4\times 25}$$
$$\frac{9\left(3+32\right)}{4\times 25}$$
$$\frac{9\times 35}{4\times 25}$$
$$\frac{315}{4\times 25}$$
$$\frac{315}{100}$$
$$\frac{63}{20}$$
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$\frac{3 ^ {2} \cdot 7}{2 ^ {2} \cdot 5} = 3\frac{3}{20} = 3.15$