$$2\frac{3}{4}+\frac{4}{4}$$
$\frac{15}{4}=3.75$
$$\frac{2\times 4+3}{4}+1$$
$$\frac{8+3}{4}+1$$
$$\frac{11}{4}+1$$
$$\frac{11}{4}+\frac{4}{4}$$
$$\frac{11+4}{4}$$
$$\frac{15}{4}$$
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$\frac{3 \cdot 5}{2 ^ {2}} = 3\frac{3}{4} = 3.75$
