#)Giải :
\(\left[\left(-\frac{56}{64}\right)--\left(\frac{1}{9}\div\frac{8}{27}\right)-\frac{1}{3}\right]\div-\frac{81}{128}\)
\(\Leftrightarrow\left[\left(-\frac{7}{8}\right)-\left(-\frac{3}{8}\right)-\frac{1}{3}\right]\div\left(-\frac{81}{128}\right)\)
\(\Leftrightarrow\left(-\frac{5}{6}\right)\div\left(-\frac{81}{128}\right)\)
\(\Leftrightarrow\frac{320}{243}\)
Tham khảo :https://h.vn/hoi-dap/question/692888.html
Hoặc hỏi trên H.vn
\(\left[-\frac{54}{64}--\left(\frac{1}{9}:\frac{8}{27}\right):-\frac{1}{3}\right]:-\frac{81}{128}\)
\(=\left[-\frac{54}{64}+\frac{3}{8}:-\frac{1}{3}\right]:-\frac{81}{128}\)
\(=\left[-\frac{54}{64}-\frac{9}{8}\right]:-\frac{81}{128}\)
\(=-\frac{63}{32}:-\frac{81}{128}\)
\(=\frac{28}{9}\)
