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8)\(\left(\dfrac{1}{3}\right)^{50}.\cdot\left(-9\right)^{25}-\dfrac{2}{3}:4\)

7)\(\left(2^2:\dfrac{4}{3}-\dfrac{1}{2}\right).\dfrac{6}{5}-17\)

6) \(16\dfrac{2}{7}:\left(\dfrac{-3}{5}\right)+28\dfrac{2}{7}:\dfrac{3}{5}\)

5) \(\left(1+\dfrac{2}{3}-\dfrac{1}{4}\right).\left(0.8-\dfrac{3}{4}\right)^2\)

4) \(23\dfrac{1}{4}.\dfrac{7}{5}-13\dfrac{1}{4}:\dfrac{5}{7}\)

3) \(\dfrac{7}{23}.\left[\left(-\dfrac{8}{6}\right)-\dfrac{45}{18}\right]\)