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Задано алгебри A ( M ;∙), B ( K ;∙), де M ={ R \{0}}, K = {-1,1}, ∙ ‑ операц...

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Задано

алгебри

A(M;∙), B(K;∙), де M={R\{0}}, K={-1,1}, ∙ ‑ операція множення. Відображення f: M→K, де f(x) = 1 при x≥0 та f(x) = -1 при x<0, є:

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