Решение:
(a − 2) · (b + 1) = а · (b + 1) - 2 · (b + 1) = ab + a - 2b - 2
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Решение:
(a − 2) · (b + 1) = а · (b + 1) - 2 · (b + 1) = ab + a - 2b - 2