Question

Срочно помогите.Кто решит тому 20 баллов​

Answer 1

Ответ:

Пошаговое объяснение:

1)

1/2 + 4/7 - 3/14 = 7/14 + 8/14 - 3/14 = 15/14 - 3/14 = 12/14 = 6/7

2)

1/5 - 2/15 + 1/30 = 6/30 - 4/30 + 1/30 = 2/30 + 1/30 = 3/30 = 1/10

3)

1/10 + 7/20 - 2/40 = 4/40 + 14/40 - 2/40 = 18/40 - 2/40 = 16/40 = 2/5

4)

17/20 - 3/10 - 11/60 = 51/60 - 18/60 - 11/60 = 51/60 - 29/60 = 22/60 = 11/30

5)

3/20 + 7/10 - 3/40 = 6/40 + 28/40 - 3/40 = 6/40 + 25/40 = 31/40

6)

9/40 + 3/4 - 19/20 = 9/40 + 30/40 - 38/40 = 39/40 - 38/40 = 1/40

Answer 2

$1) \frac{1}{2} + \frac{4}{7} - \frac{3}{14} \\ \frac{7}{14} + \frac{8}{14} - \frac{3}{14} = \frac{12}{14} = \frac{6}{7}$

$2) \frac{1}{5} - \frac{2}{15} + \frac{1}{30} \\ \frac{6}{30} - \frac{4}{30} + \frac{1}{30} = \frac{3}{30} = \frac{1}{10}$

$3) \frac{1}{10} + \frac{7}{20} - \frac{2}{40} \\ \frac{4}{40} + \frac{14}{40} - \frac{2}{40} = \frac{16}{40} = \frac{2}{5}$

$4) \frac{17}{20} - \frac{3}{10} - \frac{11}{60} \\ \frac{51}{60} - \frac{18}{60} - \frac{11}{60} = \frac{22}{60} = \frac{11}{30}$

$5) \frac{3}{20} + \frac{7}{10} - \frac{3}{40} \\ \frac{6}{40} + \frac{28}{40} - \frac{3}{40} = \frac{31}{40}$

$6) \frac{9}{40} + \frac{3}{4} - \frac{19}{20} \\ \frac{9}{40} + \frac{30}{40} - \frac{38}{40} = \frac{1}{40}$