Ответ:

\(1\frac13=\frac43\), \(3\frac12=\frac72\).

\(\frac56-\frac72=\frac5{6}-\frac{21}{6}=-\frac{16}{6}=-\frac83\).

\(\frac43:\left(-\frac83\right)=\frac43\cdot\left(-\frac38\right)=-\frac12\).

Ответ: \(-\frac12\)