Ответ:

а) \(5\frac{1}{9}-6\frac{2}{15}+\frac{8}{9}=\frac{46}{9}-\frac{92}{15}+\frac{8}{9}=6-\frac{92}{15}=-\frac{2}{15}\).

\(-\frac{2}{15}:0,8=-\frac{2}{15}:\frac{4}{5}=-\frac{1}{6}\).

\(-\frac{1}{6}+0,2=-\frac{1}{6}+\frac{1}{5}=\frac{1}{30}\).

б) \(0,152:0,5=0,304\), \(0,4:100=0,004\).

\(-\frac{1}{3}\cdot(0,304-0,004)=-\frac{1}{3}\cdot0,3=-0,1\).

в) \(3:1\frac{1}{2}=3:\frac{3}{2}=2\), \(5:1\frac{1}{4}=5:\frac{5}{4}=4\).

\(2+4=6\).

Ответ: а) \(\frac{1}{30}\); б) \(-0,1\); в) \(6\).