Ответ:
-21/2+1/6-5/6+21/3=-20/6+15/6=-5/6
-2 1/2+1/6-5/6+2 1/3=-5/2+1/6-5/6+7/3=-15/6+1/6-5/6+14/6=-5/6
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Ответ:
-21/2+1/6-5/6+21/3=-20/6+15/6=-5/6
Ответ:
-2 1/2+1/6-5/6+2 1/3=-5/2+1/6-5/6+7/3=-15/6+1/6-5/6+14/6=-5/6