August 2021 0 14 Report
Решите примеры ( /  - дробная черта  )
1) 3/8 - 2/7 + 5/8 - 5/7
2) -12/19 - 15/26 + 3/19+ 9/19
3)- 33/80 + ( 3/16 - 39/80)
4) 2/45 + ( - 3/45 + 7/9)

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