Ответ:
- \(5\frac19\cdot4=5\cdot4+\frac19\cdot4=20\frac49\).
- \(8\cdot1\frac2{31}=8\cdot1+8\cdot\frac2{31}=8\frac{16}{31}\).
- \(6\frac38\cdot8=6\cdot8+\frac38\cdot8=48+3=51\).
- \(4\cdot3\frac3{16}=4\cdot3+4\cdot\frac3{16}=12\frac34\).
Ответ: 1) \(20\frac49\); 2) \(8\frac{16}{31}\); 3) 51; 4) \(12\frac34\).
