Вычислите:
а)7/12 + 5/12
б)21/14 - 9/14
в) 29/47 + ( - 31/47)
г) - 25/39 - ( - 18/39)
а)7/12 + 5/12
б)21/14 - 9/14
в) 29/47 + ( - 31/47)
г) - 25/39 - ( - 18/39)
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Verified answer
Пошаговое объяснение:
а)
+ 
= 
= 
= 1
б)
- 
= 
= 
= 
в)
- 
= 
= 
= -
г)
- 
= 
= 
= -