Помогите пожалуйста!
-1/3 + 2 1/5
-1 1/2 - 3 1/9
-3/7 + (1/14 - 2/21)
(2/5 - 9/10) + 1/3
(2/7 - 1/14) - 5/21
/-черта дроби
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