Ответ:
- \(4 \times 2\frac{4}{5}=4\times\frac{14}{5}=\frac{56}{5}=11\frac{1}{5}\).
- \(2\times5\frac{7}{12}=2\times\frac{67}{12}=\frac{134}{12}=11\frac{1}{6}\).
- \(1\frac{7}{8}\times6=\frac{15}{8}\times6=\frac{90}{8}=11\frac{1}{4}\).
- \(2\frac{3}{10}\times5=\frac{23}{10}\times5=\frac{115}{10}=11\frac{1}{2}\).
Ответ: 4 × 2 4/5 — 11 1/5; 2 × 5 7/12 — 11 1/6; 1 7/8 × 6 — 11 1/4; 2 3/10 × 5 — 11 1/2.
