-1 + 9/11 = -11/11 + 9/11 = -2/11
5/7 - 3 = 5/7 - 21/7 = -16/7 = -2 2/7
-3 - 2,75 = -5,75
1 - 11/17 = 17/17 - 11/17 = 6/17
-3 - 2/5 = -15/5 - 2/5 = -17/5 = -3 2/5
-6 - 4 4/9 = -6 - 40/9 = -54/9 - 40/9 = -94/9 = -10 4/9
(7,8 – 4) – (7,8 + 9) = 3,8 - 16,8 = -13
(5/7 - 2,4) - (-3,6 + 5/7) = 5/7 - 2,4 + 3,6 - 5/7 = 1,2
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