Ответ:

  1. \(−10+7=−3\).
  2. \(−4,6+6,3=1,7\).
  3. \(13,8+(−5,2)=13,8−5,2=8,6\).
  4. \(7,14+(−12,4)=7,14−12,4=−5,26\).
  5. \(−4,8+4,8=0\).
  6. \(−1+0,329=−0,671\).
  7. \(−\frac{5}{14}+\frac{7}{10}=−\frac{25}{70}+\frac{49}{70}=\frac{24}{70}=\frac{12}{35}\).
  8. \(4\frac{2}{7}+(−1\frac{4}{5})=\frac{30}{7}−\frac{9}{5}=\frac{150−63}{35}=\frac{87}{35}=2\frac{17}{35}\).
  9. \(−6\frac{5}{6}+3\frac{5}{8}=−\frac{41}{6}+\frac{29}{8}=−\frac{164}{24}+\frac{87}{24}=−\frac{77}{24}=−3\frac{5}{24}\).

Ответ: 1) −3; 2) 1,7; 3) 8,6; 4) −5,26; 5) 0; 6) −0,671; 7) \(\frac{12}{35}\); 8) \(2\frac{17}{35}\); 9) \(−3\frac{5}{24}\).