$$\frac{ 7 }{ 5 } + \frac{ 3 }{ 10 } + \frac{ 9 }{ 12 } =$$
$\frac{49}{20}=2.45$
$$\frac{14}{10}+\frac{3}{10}+\frac{9}{12}$$
$$\frac{14+3}{10}+\frac{9}{12}$$
$$\frac{17}{10}+\frac{9}{12}$$
$$\frac{17}{10}+\frac{3}{4}$$
$$\frac{34}{20}+\frac{15}{20}$$
$$\frac{34+15}{20}$$
$$\frac{49}{20}$$
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$\frac{7 ^ {2}}{2 ^ {2} \cdot 5} = 2\frac{9}{20} = 2.45$
