Ответ:
- \(\left(\frac{51}{60}\cdot\frac{12}{17}\right):\frac{3}{10}=\left(\frac{17}{20}\cdot\frac{12}{17}\right)\cdot\frac{10}{3}=\frac35\cdot\frac{10}{3}=2\).
- \(\left(\frac{12}{95}:\frac{9}{38}\right)\cdot\frac{15}{16}:3=\left(\frac{12}{95}\cdot\frac{38}{9}\right)\cdot\frac{15}{16}\cdot\frac13=\frac{8}{15}\cdot\frac{15}{16}\cdot\frac13=\frac16\).
- \(\left(3\frac{1}{12}+1\frac{5}{12}\right):1\frac12=\left(\frac{37}{12}+\frac{17}{12}\right):\frac32=\frac92\cdot\frac23=3\).
- \(\frac34:\frac56+2\frac12\cdot\frac23-1:1\frac19=\frac34\cdot\frac65+\frac52\cdot\frac23-1\cdot\frac9{10}=\frac9{10}+\frac53-\frac9{10}=\frac53\).
- \(7\frac18:4\frac34\cdot8=\frac{57}{8}:\frac{19}{4}\cdot8=\frac{57}{8}\cdot\frac4{19}\cdot8=12\).
Ответ: 1) 2; 2) \(\frac16\); 3) 3; 4) \(\frac53\); 5) 12.
