Почему верно равенство: А) (27+13)-8=27+13-8
Б) m-(n+k)=m-n-k
B) a-b-c=(a-b)-c
Г) x-y+z=(x-y)+z?
Б) m-(n+k)=m-n-k
B) a-b-c=(a-b)-c
Г) x-y+z=(x-y)+z?
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