$$\frac{ 15 }{ 8 } - \frac{ 6 }{ 8 } + \frac{ 13 }{ 8 }$$
$\frac{11}{4}=2.75$
$$\frac{15-6}{8}+\frac{13}{8}$$
$$\frac{9}{8}+\frac{13}{8}$$
$$\frac{9+13}{8}$$
$$\frac{22}{8}$$
$$\frac{11}{4}$$
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$\frac{11}{2 ^ {2}} = 2\frac{3}{4} = 2.75$
