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Números e Funções Reais PROFMAT Prove que f(X U Y ) = f(X) U f(Y ) | Seja f : A → B uma função
2 years ago
Seja f : A → B uma função. Dê as definições de f(X) e f−1(Y ), para X ⊂ A e Y ⊂ B. Se f : R →R e dada por f(x) = 2x² + 3x + 4, determine os conjuntos f(R) e f−1(3).
Seja f : A→ B uma função. Prove que f(XU Y ) = f(X) U f(Y ), quaisquer que sejam X; Y ⊂ A. Dê um
exemplo em que f(XUY ) ≠ f(X)U f(Y )
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