$$\frac{5}{4}+(\frac{5}{2}-\frac{1}{5})$$
$\frac{71}{20}=3.55$
$$\frac{5}{4}+\frac{10}{4}-\frac{1}{5}$$
$$\frac{5+10}{4}-\frac{1}{5}$$
$$\frac{15}{4}-\frac{1}{5}$$
$$\frac{75}{20}-\frac{4}{20}$$
$$\frac{75-4}{20}$$
$$\frac{71}{20}$$
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$\frac{71}{2 ^ {2} \cdot 5} = 3\frac{11}{20} = 3.55$