$$\frac{9}{15}-\frac{4}{6}\times\frac{4}{6}=$$
$\frac{7}{45}\approx 0.155555556$
$$\frac{9}{15}-\left(\frac{4}{6}\right)^{2}$$
$$\frac{3}{5}-\left(\frac{4}{6}\right)^{2}$$
$$\frac{3}{5}-\left(\frac{2}{3}\right)^{2}$$
$$\frac{3}{5}-\frac{4}{9}$$
$$\frac{27}{45}-\frac{20}{45}$$
$$\frac{27-20}{45}$$
$$\frac{7}{45}$$
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$\frac{7}{3 ^ {2} \cdot 5} = 0.15555555555555556$
