September 2021 0 66 Report
Почему верно равенство: a) (27 + 13) – 8 = 27 + 13 – 8;
б) (m + n) + k = m + n + k;
в) a – b – c = (a – b) – c;
г) x – y + z = (x – y) + z?

На основании какого свойства вычитания верно равенство:
а) (a + b) – c = a – c + b;
б) m – (n + k) = m – n – k;
в) m – n + k = (m + k) – n;
г) c – d – k = c – (d + k)
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