Ответ:

\((-4{,}5):\frac{9}{14}=-4{,}5\cdot\frac{14}{9}=-7\).

\(-8\frac{2}{9}-(-7)=-\frac{74}{9}+\frac{63}{9}=-\frac{11}{9}\).

\(-\frac{11}{9}\cdot2\frac{1}{4}=-\frac{11}{9}\cdot\frac{9}{4}=-\frac{11}{4}\).

\(-3\frac{3}{4}-\left(-\frac{11}{4}\right)=-\frac{15}{4}+\frac{11}{4}=-1\).

Ответ: −1.