Ответы на вопрос:
12/5а×(+1 3/4)×(-1 1/4)×(-2 2/7в)=-7/5а×7/4×(-5/4)×(-16/7в)= =-1а×7×(-1)×(-1в)=-7а×(-1)×(-в)=7а×(-в)=-7ав
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