$$2\frac{3}{4}-3\frac{1}{8}+1\frac{1}{12}$$
$\frac{17}{24}\approx 0.708333333$
$$\frac{8+3}{4}-\frac{3\times 8+1}{8}+\frac{1\times 12+1}{12}$$
$$\frac{11}{4}-\frac{3\times 8+1}{8}+\frac{1\times 12+1}{12}$$
$$\frac{11}{4}-\frac{24+1}{8}+\frac{1\times 12+1}{12}$$
$$\frac{11}{4}-\frac{25}{8}+\frac{1\times 12+1}{12}$$
$$\frac{22}{8}-\frac{25}{8}+\frac{1\times 12+1}{12}$$
$$\frac{22-25}{8}+\frac{1\times 12+1}{12}$$
$$-\frac{3}{8}+\frac{1\times 12+1}{12}$$
$$-\frac{3}{8}+\frac{12+1}{12}$$
$$-\frac{3}{8}+\frac{13}{12}$$
$$-\frac{9}{24}+\frac{26}{24}$$
$$\frac{-9+26}{24}$$
$$\frac{17}{24}$$
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$\frac{17}{2 ^ {3} \cdot 3} = 0.7083333333333334$
