856 Заполните пропуски: a) 2 + 5 + (-7) = 2 + (-7) +...; 6) 4 + ... + (-1) = (-1) + (4 + (-2)); в b) -3+ ... + (-6) = 2 + (...+ (-3)); r) -1 + ... + ... = (2+ (4)) + ...... плизззз​
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