№1
а) = б) = в) =
- 1/5 - 3/5 = - 4/5 5/7 - 6/7 = - 1/7 - 7/9 + 8/9 = 1/9
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№ 2
а) =
- 2/5 - 7/15 = - 6/15 - 7/15 = - 13/15
б) =
- 1/3 + 1/2 = - 2/6 + 3/6 = 1/6
в) =
- 5/18 + 1/24 = - 20/72 + 3/72 = - 17/72
----------------------------------------------------------
№3
= 11/48 - 9/16 = 11/48 - 27/48 = - 16/48 = - 1/3
---------------------------------------------------------
№ 4
=
2/3 - 4/9 + 8/27 - 16/81 = 54/81 - 36/81 + 24/81 - 16/81 =
= 26/81