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(-x^2+2x-1)/(x+1)(x+2)≥0⇔(x^2-2x+1)/(x+1)(x+2)≤0⇔(x-1)^2*/(x+1)(x+2)≤0
⇔(x+1)(x+2)<0 si x=1
x∈(-2;1)∨{1}