$$[(\frac{3}{7}+\frac{1}{2}):\frac{13}{2}]^{2}+[(\frac{5}{7}-\frac{1}{2})\cdot\frac{2}{3}]^{2}-\frac{2}{49}$$
$0$
$$\left(\frac{\frac{13}{14}}{\frac{13}{2}}\right)^{2}+\left(\left(\frac{5}{7}-\frac{1}{2}\right)\times \frac{2}{3}\right)^{2}-\frac{2}{49}$$
$$\left(\frac{13}{14}\times \frac{2}{13}\right)^{2}+\left(\left(\frac{5}{7}-\frac{1}{2}\right)\times \frac{2}{3}\right)^{2}-\frac{2}{49}$$
$$\left(\frac{1}{7}\right)^{2}+\left(\left(\frac{5}{7}-\frac{1}{2}\right)\times \frac{2}{3}\right)^{2}-\frac{2}{49}$$
$$\frac{1}{49}+\left(\left(\frac{5}{7}-\frac{1}{2}\right)\times \frac{2}{3}\right)^{2}-\frac{2}{49}$$
$$\frac{1}{49}+\left(\frac{3}{14}\times \frac{2}{3}\right)^{2}-\frac{2}{49}$$
$$\frac{1}{49}+\left(\frac{1}{7}\right)^{2}-\frac{2}{49}$$
$$\frac{1}{49}+\frac{1}{49}-\frac{2}{49}$$
$$\frac{2}{49}-\frac{2}{49}$$
$$0$$
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