5. Выполните сложение: a) -1/2+1/4 б) -1/9+(-2/3) B) -3/8+(-1/2) 6. Выполните сложение: a) -1/6+2/3 б) -4/5+(-1/10) B) -5/9+(-1/3) 7. Выполните действие: a) -4,8-5,9 б) 1,2-12,3 B) 1/4-2/5 8. Выполните действие: a) 45-(-23) б) 26-39 в) -39,8-(-23,5) г) -14,7-17,4 д) 3/7-4 e) -11/12-(-8/9) ж) -5 3/28+4 5/12 з) -3 7/12-2 5/8 9. Выполните вычитание: a) -3,6-4,7 б) 6,3-(-8,1) в) 4 1/5-5 2/7 г) -6 5/24-(-5 13/30) 10. Выполните действие: a) -3,8-5,4 б) 1,7-17,3 B) -7 1/9-1/2 11. Выполните действия: -0,55+(13/28-5/7). 12. Вычислите: a) -4+7+(-9)+8 б) -12+7+(-3)+9 в) 18-12-4+3 г) -7+8-4-5+10-1 13. Вычислите: a) -3+6+(-2)+10 б) 6+(-11)+7+(-8) в) 2-11+6-7+3 г) 11-3+1-6+2-4

5. Выполните сложение:

a) −\(\frac{1}{2}\) + \(\frac{1}{4}\) = −\(\frac{2}{4}\) + \(\frac{1}{4}\) = −\(\frac{1}{4}\)

б) −\(\frac{1}{9}\) + (−\(\frac{2}{3}\)) = −\(\frac{1}{9}\) − \(\frac{6}{9}\) = −\(\frac{7}{9}\)

в) −\(\frac{3}{8}\) + (−\(\frac{1}{2}\)) = −\(\frac{3}{8}\) − \(\frac{4}{8}\) = −\(\frac{7}{8}\)

6. Выполните сложение:

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

б) −\(\frac{4}{5}\) + (−\(\frac{1}{10}\)) = −\(\frac{8}{10}\) − \(\frac{1}{10}\) = −\(\frac{9}{10}\)

в) −\(\frac{5}{9}\) + (−\(\frac{1}{3}\)) = −\(\frac{5}{9}\) − \(\frac{3}{9}\) = −\(\frac{8}{9}\)

7. Выполните действие:

a) −4.8 − 5.9 = −10.7

б) 1.2 − 12.3 = −11.1

в) \(\frac{1}{4}\) − \(\frac{2}{5}\) = \(\frac{5}{20}\) − \(\frac{8}{20}\) = −\(\frac{3}{20}\)

8. Выполните действие:

a) 45 − (−23) = 45 + 23 = 68

б) 26 − 39 = −13

в) −39.8 − (−23.5) = −39.8 + 23.5 = −16.3

г) −14.7 − 17.4 = −32.1

д) \(\frac{3}{7}\) − 4 = \(\frac{3}{7}\) − \(\frac{28}{7}\) = −\(\frac{25}{7}\) = -3 \(\frac{4}{7}\)

e) −\(\frac{11}{12}\) − (−\(\frac{8}{9}\)) = −\(\frac{11}{12}\) + \(\frac{8}{9}\) = −\(\frac{33}{36}\) + \(\frac{32}{36}\) = −\(\frac{1}{36}\)

ж) −5 \(\frac{3}{28}\) + 4 \(\frac{5}{12}\) = -5 \(\frac{9}{84}\) + 4 \(\frac{35}{84}\) = -1 + \(\frac{26}{84}\) = -1 + \(\frac{13}{42}\) = -\(\frac{29}{42}\)

з) −3 \(\frac{7}{12}\) − 2 \(\frac{5}{8}\) = -3 \(\frac{14}{24}\) - 2 \(\frac{15}{24}\) = -5 \(\frac{29}{24}\) = -6 \(\frac{5}{24}\)

9. Выполните вычитание:

a) −3.6 − 4.7 = -8.3

б) 6.3 − (−8.1) = 6.3 + 8.1 = 14.4

в) 4 \(\frac{1}{5}\) − 5 \(\frac{2}{7}\) = \(\frac{21}{5}\) - \(\frac{37}{7}\) = \(\frac{147}{35}\) - \(\frac{185}{35}\) = -\(\frac{38}{35}\) = -1 \(\frac{3}{35}\)

г) −6 \(\frac{5}{24}\) − (−5 \(\frac{13}{30}\)) = −6 \(\frac{5}{24}\) + 5 \(\frac{13}{30}\) = -6 \(\frac{25}{120}\) + 5 \(\frac{52}{120}\) = -1 + \(\frac{27}{120}\) = -1 + \(\frac{9}{40}\) = -\(\frac{31}{40}\)

10. Выполните действие:

a) −3.8 − 5.4 = -9.2

б) 1.7 − 17.3 = -15.6

в) −7 \(\frac{1}{9}\) − \(\frac{1}{2}\) = -\(\frac{64}{9}\) - \(\frac{1}{2}\) = -\(\frac{128}{18}\) - \(\frac{9}{18}\) = -\(\frac{137}{18}\) = -7 \(\frac{11}{18}\)

11. Выполните действия:

−0.55 + (\(\frac{13}{28}\) − \(\frac{5}{7}\)) = -0.55 + (\(\frac{13}{28}\) − \(\frac{20}{28}\)) = -0.55 + (−\(\frac{7}{28}\)) = -0.55 - \(\frac{1}{4}\) = -0.55 - 0.25 = -0.8

12. Вычислите:

a) -4 + 7 + (-9) + 8 = 3 - 9 + 8 = -6 + 8 = 2

б) -12 + 7 + (-3) + 9 = -5 - 3 + 9 = -8 + 9 = 1

в) 18 - 12 - 4 + 3 = 6 - 4 + 3 = 2 + 3 = 5

г) -7 + 8 - 4 - 5 + 10 - 1 = 1 - 4 - 5 + 10 - 1 = -3 - 5 + 10 - 1 = -8 + 10 - 1 = 2 - 1 = 1

13. Вычислите:

a) -3 + 6 + (-2) + 10 = 3 - 2 + 10 = 1 + 10 = 11

б) 6 + (-11) + 7 + (-8) = -5 + 7 - 8 = 2 - 8 = -6

в) 2 - 11 + 6 - 7 + 3 = -9 + 6 - 7 + 3 = -3 - 7 + 3 = -10 + 3 = -7

г) 11 - 3 + 1 - 6 + 2 - 4 = 8 + 1 - 6 + 2 - 4 = 9 - 6 + 2 - 4 = 3 + 2 - 4 = 5 - 4 = 1

Ответ: смотри выше