$$1 \frac { 2 } { 5 } + 2 \frac { 6 } { 10 } + \frac { 1 } { 2 }$$
$\frac{9}{2}=4.5$
$$\frac{5+2}{5}+\frac{2\times 10+6}{10}+\frac{1}{2}$$
$$\frac{7}{5}+\frac{2\times 10+6}{10}+\frac{1}{2}$$
$$\frac{7}{5}+\frac{20+6}{10}+\frac{1}{2}$$
$$\frac{7}{5}+\frac{26}{10}+\frac{1}{2}$$
$$\frac{7}{5}+\frac{13}{5}+\frac{1}{2}$$
$$\frac{7+13}{5}+\frac{1}{2}$$
$$\frac{20}{5}+\frac{1}{2}$$
$$4+\frac{1}{2}$$
$$\frac{8}{2}+\frac{1}{2}$$
$$\frac{8+1}{2}$$
$$\frac{9}{2}$$
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$\frac{3 ^ {2}}{2} = 4\frac{1}{2} = 4.5$
