3) \(((\frac{2}{3,4}+\frac{5}{5,1}-2\frac{3}{34})\cdot(103,2-103\frac{669}{795})):(-2\frac{1}{6}+3,2:3,84)\)

1. \(\frac{2}{3,4}+\frac{5}{5,1}-2\frac{3}{34}=\frac{10}{17}+\frac{50}{51}-\frac{71}{34}=-\frac{53}{102}\).
2. \(103,2-103\frac{669}{795}=\frac{516}{5}-\frac{27518}{265}=-\frac{34}{53}\).
3. Произведение: \(-\frac{53}{102}\cdot(-\frac{34}{53})=\frac13\).
4. \(-2\frac16+3,2:3,84=-\frac{13}{6}+\frac{320}{384}=-\frac{13}{6}+\frac56=-\frac43\).
5. \(\frac13:(-\frac43)=\frac13\cdot(-\frac34)=-\frac14\).

Ответ: \(-\frac14\)