$$(\frac{3}{20}:\frac{3}{10})^{2}+[(\frac{2}{7}-\frac{1}{14})\cdot\frac{7}{9}]^{2}+(\frac{2}{3})^{2}$$
$\frac{13}{18}\approx 0.722222222$
$$\left(\frac{3}{20}\times \frac{10}{3}\right)^{2}+\left(\left(\frac{2}{7}-\frac{1}{14}\right)\times \frac{7}{9}\right)^{2}+\left(\frac{2}{3}\right)^{2}$$
$$\left(\frac{1}{2}\right)^{2}+\left(\left(\frac{2}{7}-\frac{1}{14}\right)\times \frac{7}{9}\right)^{2}+\left(\frac{2}{3}\right)^{2}$$
$$\frac{1}{4}+\left(\left(\frac{2}{7}-\frac{1}{14}\right)\times \frac{7}{9}\right)^{2}+\left(\frac{2}{3}\right)^{2}$$
$$\frac{1}{4}+\left(\frac{3}{14}\times \frac{7}{9}\right)^{2}+\left(\frac{2}{3}\right)^{2}$$
$$\frac{1}{4}+\left(\frac{1}{6}\right)^{2}+\left(\frac{2}{3}\right)^{2}$$
$$\frac{1}{4}+\frac{1}{36}+\left(\frac{2}{3}\right)^{2}$$
$$\frac{5}{18}+\left(\frac{2}{3}\right)^{2}$$
$$\frac{5}{18}+\frac{4}{9}$$
$$\frac{13}{18}$$
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$\frac{13}{2 \cdot 3 ^ {2}} = 0.7222222222222222$
