Question

вычислите
номер 437

дам 20 баллов ​

Answer 1

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 = 3/15 - 2/15 + 1/30 =

1/15 + 1/30 = 2/30 + 1/30 = 3/30 = 1/10

3) 1/10 + 7/20 - 2/40 = 2/20 + 7/20 - 2/40

= 27/20 - 2/40 = 27/20 - 1/20 = 26/20 =

13/10

4) 17/20 - 3/10 - 11/60 = 17/20 - 6/20 -

11/60 = 11/20 - 11/60 = 33/60 - 11/60 =

22/60 = 11/30

5) 3/20 + 7/10 - 3/40 = 3/20 + 14/20 - 3/40

= 17/20 - 3/40 = 34/40 - 3/40 = 31/40 =

31/40

6) 9/40 + 3/4 - 19/20 = 9/40 + 30/40 -

19/20 = 39/40 - 19/20 = 39/40 - 38/40 =

1/40