Ответ:
\(2\frac{8}{11}=\frac{30}{11}\), \(8.9=\frac{89}{10}\).
\(\frac{30}{11}-\frac{89}{10}=\frac{300-979}{110}=-\frac{679}{110}=-6\frac{19}{110}\).
Ответ: \(-6\frac{19}{110}\).
\(2\frac{8}{11}=\frac{30}{11}\), \(8.9=\frac{89}{10}\).
\(\frac{30}{11}-\frac{89}{10}=\frac{300-979}{110}=-\frac{679}{110}=-6\frac{19}{110}\).
Ответ: \(-6\frac{19}{110}\).