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[attach]65369[/attach] Numero 28 [attach]65367[/attach] Questa foto non si legge  No

casio · Accepted Answer

[attach]65375[/attach]

exProf · Answer

28) (x - 1)/(x^2 - 1) - 1/(x + 1) <= (1- x)/(x + 1)^2 ≡
≡ (x - 1)/(x^2 - 1) - 1/(x + 1) - (1- x)/(x + 1)^2 <= 0 ≡
≡ (x - 1)/(x + 1)^2 <= 0 ≡
≡ (x - 1 <= 0) & (x^2 - 1 != 0) & (x + 1 != 0) & ((x + 1)^2 != 0) ≡
≡ (x <= 1) & (x != - 1)
http://www.wolframalpha.com/input?i=%28x-1%29%2F%28x%5E2-1%29-1%2F%28x--1%29%3C%3D%281-x%29%2F%28x--1%29%5E2

exProf

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30/12/2023 22:44