$$1\frac{1}{2}\div3\frac{3}{5}$$
$\frac{5}{12}\approx 0.416666667$
$$\frac{\left(1\times 2+1\right)\times 5}{2\left(3\times 5+3\right)}$$
$$\frac{\left(2+1\right)\times 5}{2\left(3\times 5+3\right)}$$
$$\frac{3\times 5}{2\left(3\times 5+3\right)}$$
$$\frac{15}{2\left(3\times 5+3\right)}$$
$$\frac{15}{2\left(15+3\right)}$$
$$\frac{15}{2\times 18}$$
$$\frac{15}{36}$$
$$\frac{5}{12}$$
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$\frac{5}{2 ^ {2} \cdot 3} = 0.4166666666666667$
