[(\(\dfrac{-1}{2}\))² - 1,2] -(0,8 - \(\dfrac{3}{4}\))

(\(\dfrac{-3}{4}\))^{3x - 1} = \(\dfrac{256}{81}\)

Có thể chia ra 2 trường hợp

\(\dfrac{6}{35}\) : ( x - \(\dfrac{1}{2}\) ) = \(\dfrac{-3}{25}\)

12\(\dfrac{3}{5}\) : \(\dfrac{-5}{7}\) + 2\(\dfrac{2}{5}\) : \(\dfrac{-5}{7}\)

a \(\dfrac{-4}{7}\) - \(\dfrac{5}{13}\) x \(\dfrac{-39}{25}\) + \(\dfrac{-1}{42}\) : \(\dfrac{-5}{6}\)

b \(\dfrac{2}{9}\) x [\(\dfrac{4}{45}\): ( \(\dfrac{1}{5}\) - \(\dfrac{2}{15}\)) + 1\(\dfrac{2}{3}\)] - \(\dfrac{-5}{27}\)