1. Найти значение выражения: 1) (6,9−1,5)/2,4; 2) (19/8+11/12):5/48; 3) 13 3/4+(3,25−1 1/3·2,01).

1) \(\dfrac{6.9-1.5}{2.4}=\dfrac{5.4}{2.4}=2.25\).

2) \(\left(\dfrac{19}{8}+\dfrac{11}{12}\right):\dfrac{5}{48}=\left(\dfrac{57}{24}+\dfrac{22}{24}\right)\cdot\dfrac{48}{5}=\dfrac{79}{24}\cdot\dfrac{48}{5}=\dfrac{158}{5}=31.6\).

3) \(13\dfrac{3}{4}+\left(3.25-1\dfrac{1}{3}\cdot2.01\right)=13.75+\left(3.25-\dfrac{4}{3}\cdot\dfrac{201}{100}\right)\).

\(\dfrac{4}{3}\cdot\dfrac{201}{100}=\dfrac{67}{25}=2.68\), поэтому \(13.75+(3.25-2.68)=13.75+0.57=14.32\).

Ответ: 1) 2,25; 2) 31,6; 3) 14,32.