Вычислите:1) 7/15- 2/15, 2) 2/9-2/15, 3) 11/12-5\12

Question

Вычислите:1) 7/15- 2/15, 2) 2/9-2/15, 3) 11/12-5\12

Answer 1

7        2     5      1                                                2     2       10        6      4

---  - ---=-----= ----(были сокращ. 5 и 15)    ---- - --- = -----  -  ---- =   ----

15  15     15    3                                                9      15     45       45   45

 

11      5        6     1

---- -  ---  =----- = ----

12      12   12      2