$$\frac { 13 } { 36 } - \frac { 2 } { 40 }$$
$\frac{14}{45}\approx 0.311111111$
$$\frac{13}{36}-\frac{1}{20}$$
$$\frac{65}{180}-\frac{9}{180}$$
$$\frac{65-9}{180}$$
$$\frac{56}{180}$$
$$\frac{14}{45}$$
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$\frac{2 \cdot 7}{3 ^ {2} \cdot 5} = 0.3111111111111111$
