447. Қосуды орындаңдар: 1) −2 1/6 + 3 1/15; 2) −4 7/9 + 5/6; 3) 5 2/7 + (−3 7/8).

1) Бөлшектердің ортақ бөлімі — 30:

\(-2\frac{1}{6}+3\frac{1}{15}=-\frac{13}{6}+\frac{46}{15}=-\frac{65}{30}+\frac{92}{30}=\frac{27}{30}=\frac{9}{10}\).

2) \(-4\frac{7}{9}+\frac{5}{6}=-\frac{43}{9}+\frac{5}{6}=-\frac{86}{18}+\frac{15}{18}=-\frac{71}{18}=-3\frac{17}{18}\).

3) \(5\frac{2}{7}+\left(-3\frac{7}{8}\right)=\frac{37}{7}-\frac{31}{8}=\frac{296}{56}-\frac{217}{56}=\frac{79}{56}=1\frac{23}{56}\).

Жауабы: 1) \(\frac{9}{10}\); 2) \(-3\frac{17}{18}\); 3) \(1\frac{23}{56}\).