384. Өрнектің мәнін табыңдар: 1) (−1 2/5 + (−3,6)) + (−2 5/6 + (−2/3)); 2) (−5/8 + (−3/4)) + (−7,6 + (−2 2/5)).

1. Аралас сандарды бөлшекке айналдырамыз:

   \(−1\frac{2}{5}=−\frac{7}{5}\), \(−2\frac{5}{6}=−\frac{17}{6}\).

   \((−1\frac{2}{5}−3,6)+(−2\frac{5}{6}−\frac{2}{3})\)

   \(=(−1,4−3,6)+(−2\frac{5}{6}−\frac{2}{3})\)

   \(=−5+\left(−\frac{17}{6}−\frac{4}{6}\right)=−5−\frac{21}{6}=−5−3,5=−8,5=−8\frac{1}{2}\).

2. \(−2\frac{2}{5}=−2,4\).

   \((−\frac{5}{8}−\frac{3}{4})+(−7,6−2,4)\)

   \(=\left(−\frac{5}{8}−\frac{6}{8}\right)−10=−\frac{11}{8}−\frac{80}{8}=−\frac{91}{8}=−11\frac{3}{8}\).

Жауабы: 1) −8 1/2; 2) −11 3/8.