Решите по математике ​

Решение / ответ:

1) 15 + 12 + 35 = (15 + 35) + 12 = 50 + 12 = 62.

2) 23 + 17 + 45 = (23 + 17) + 45 = 40 + 45 = 85.

3) (34 + 25) - 14 = 34 + 25 - 14 = (34 - 14) + + 25 = 20 + 25 = 45.

4) (34 + 26) - 17 = 60 - 17 = 43.

5) 60 - (34 + 15) = 60 - 34 - 15 = (60 - 15) - 34 =

= 45 - 34 = 11.

6) 60 - (50 + 3) = 60 - 50 - 3 = (60 - 50) - 3 =

= 10 - 3 = 7.

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