$$3 \frac { 2 } { 5 } + \frac{ 3 }{ 8 } - 1 \frac { 1 } { 4 }$$
$\frac{101}{40}=2.525$
$$\frac{15+2}{5}+\frac{3}{8}-\frac{1\times 4+1}{4}$$
$$\frac{17}{5}+\frac{3}{8}-\frac{1\times 4+1}{4}$$
$$\frac{136}{40}+\frac{15}{40}-\frac{1\times 4+1}{4}$$
$$\frac{136+15}{40}-\frac{1\times 4+1}{4}$$
$$\frac{151}{40}-\frac{1\times 4+1}{4}$$
$$\frac{151}{40}-\frac{4+1}{4}$$
$$\frac{151}{40}-\frac{5}{4}$$
$$\frac{151}{40}-\frac{50}{40}$$
$$\frac{151-50}{40}$$
$$\frac{101}{40}$$
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$\frac{101}{2 ^ {3} \cdot 5} = 2\frac{21}{40} = 2.525$
