b)\(\left(\frac{3}{7}\right)^{21}\div\left(\frac{9}{49}\right)^6\)
c) 3\(-\)\(\left(\frac{6}{7}\right)^0+\left(\frac{1}{2}\right)^2\div2\)
d) \(\left(\frac{-7}{4}\div\frac{5}{8}\right)\times\frac{11}{16}\)
e) \(\frac{2}{3}+\frac{1}{3}\times\frac{-6}{10}\)