Question

$Sa~se~determine~inf(A)~si~sup(A)~pentru~multimile:\\ \\ a)~A=\{\frac{n}{n+1}|~n\in~N*\}\\ \\ b)~A=\{x^2+x~|~x\in(-1,1)\}\\ \\ c)~A=\{\frac{2x}{x^2+1} ~|~x\in~R\}$

Answer 1

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