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Sagot :

1 / (x^2-9) <= 1
1-1/(x²-9) >= 0
(x²-9-1)/(x²-8) >=0
(x²-8)/(x²-9) >=0
on effectue un tableau de signes
donc x<-3 ou -2√2 <= x <= 2√2 ou x>3

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