Thực hiện phép tính hợp lý: 18/11 . − 7/9 − 18/11 . 16/9 + 18/11 . 1/9 .

\(\frac{{18}}{{11}}.\frac{{ - 7}}{9} - \frac{{18}}{{11}}.\frac{{16}}{9} + \frac{{18}}{{11}}.\frac{1}{9}\)

\( = \frac{{18}}{{11}} \cdot \left( {\frac{{ - 7}}{9} - \frac{{16}}{9} + \frac{1}{9}} \right)\)

\( = \frac{{18}}{{11}} \cdot \frac{{ - 22}}{9}\)

\( = - 4.\)