Ответ:
- \(\frac27\cdot\frac35=\frac6{35}\).
- \(\frac34\cdot\frac56=\frac{15}{24}=\frac58\).
- \(\frac47\cdot\frac79=\frac4{9}\).
- \(\frac{15}{16}\cdot\frac{48}{55}=\frac{15\cdot3}{55}=\frac{45}{55}=\frac9{11}\).
Ответ: 1) \(\frac6{35}\); 2) \(\frac58\); 3) \(\frac49\); 4) \(\frac9{11}\).
