Выполните умножение: 1) 11/12 · 24; 2) 14 · 23/28; 3) 5/21 · 12; 4) 11/25 · 15.

1. \(\dfrac{11}{12}\cdot24=11\cdot2=22\).
2. \(14\cdot\dfrac{23}{28}=\dfrac{14}{28}\cdot23=\dfrac12\cdot23=\dfrac{23}{2}=11\dfrac12\).
3. \(\dfrac{5}{21}\cdot12=\dfrac{5\cdot12}{21}=\dfrac{60}{21}=\dfrac{20}{7}=2\dfrac67\).
4. \(\dfrac{11}{25}\cdot15=\dfrac{11\cdot15}{25}=\dfrac{165}{25}=\dfrac{33}{5}=6\dfrac35\).

Ответ: 1) 22; 2) \(11\dfrac12\); 3) \(2\dfrac67\); 4) \(6\dfrac35\).