$$(8+ \frac{ 2 }{ 5 } ) \div (6- \frac{ 9 }{ 4 } )=$$
$\frac{56}{25}=2.24$
$$\frac{\frac{40}{5}+\frac{2}{5}}{6-\frac{9}{4}}$$
$$\frac{\frac{40+2}{5}}{6-\frac{9}{4}}$$
$$\frac{\frac{42}{5}}{6-\frac{9}{4}}$$
$$\frac{\frac{42}{5}}{\frac{24}{4}-\frac{9}{4}}$$
$$\frac{\frac{42}{5}}{\frac{24-9}{4}}$$
$$\frac{\frac{42}{5}}{\frac{15}{4}}$$
$$\frac{42}{5}\times \frac{4}{15}$$
$$\frac{42\times 4}{5\times 15}$$
$$\frac{168}{75}$$
$$\frac{56}{25}$$
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$\frac{2 ^ {3} \cdot 7}{5 ^ {2}} = 2\frac{6}{25} = 2.24$
