Ответ:
-3/7 - 2/7 = -5/7
2/5 - 4/5 = -2/5
1/5 - 7/15 = -4/15
-1/2 - (-2/3) = 1/6
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Ответ:
-3/7 - 2/7 = -5/7
2/5 - 4/5 = -2/5
1/5 - 7/15 = -4/15
-1/2 - (-2/3) = 1/6