$$11 \frac { 9 } { 10 } - \frac { 7 } { 10 }$$
$\frac{56}{5}=11.2$
$$\frac{110+9}{10}-\frac{7}{10}$$
$$\frac{119}{10}-\frac{7}{10}$$
$$\frac{119-7}{10}$$
$$\frac{112}{10}$$
$$\frac{56}{5}$$
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$\frac{2 ^ {3} \cdot 7}{5} = 11\frac{1}{5} = 11.2$
