\(\frac{7}{18}.\frac{8}{11}-\frac{7}{9}.\frac{8}{11}-11:\frac{9}{2}\)
\(=\frac{8}{11}.\left(\frac{7}{18}-\frac{7}{9}\right)-11:\frac{9}{2}\)
\(=\frac{8}{11}.\left(-\frac{7}{18}\right)-11:\frac{9}{2}\)
\(=-\frac{28}{99}-\frac{22}{9}\)
\(=-\frac{30}{11}\)
Tk mk nha!!!!!!