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1.不等式 x²-2x-2≥1 中,令t=x≥0,x²=x²=t²,t²-2t-2≥1,→ t²-2t-2≤-1,或 t²-2t-2≥1,t²-2t-1≤0,或 t²-2t-3≥0,0≤t≤1+√2,或 t≥3,-(1+√2)≤x≤ 1+√2...
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