-1/6-2/9= -1*9/6-2*6/9= -9-12/54= -21/54(сокр.3)= -7/18
Отв: -7/18 b
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-1/6-2/9= -1*9/6-2*6/9= -9-12/54= -21/54(сокр.3)= -7/18
Отв: -7/18 b