$$1\frac{1}{2}-\frac{3}{5}=$$
$\frac{9}{10}=0.9$
$$\frac{2+1}{2}-\frac{3}{5}$$
$$\frac{3}{2}-\frac{3}{5}$$
$$\frac{15}{10}-\frac{6}{10}$$
$$\frac{15-6}{10}$$
$$\frac{9}{10}$$
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$\frac{3 ^ {2}}{2 \cdot 5} = 0.9$
