-57177.33+24723/(1+x)+25023/(1+x)^-2+25323/(1+x)^-3<0
    -57177.33+24723/(1+x)+25023/(1+x)^-2+25323/(1+x)^-3<0
    t+1/t≥5/2
    0.87（9－x）+1.13x≥9
    0.6（4－x）+1.4x≥4
    -1≤x^2-2x≤3
    x^2-5x+16＞0
    （y-2）^2+（2y+2）^2≥3
    （y-2）^2+（2y+2）^2≤-3
    1.1×1810×10^6≤18.4×1400×x×(1550-x/2)
    1.1×3639.4×10^6≤18.4×1400×x×(1550-x/2)
    1.1×132.65×10^6≤18.4×1400×x×(1550-x/2)
    1.1×986.7×10^6≤18.4×1400×x×(1550-x/2)
    1.1×12.4×10^6≤18.4×1400×x×(1550-x/2)
    1.1×18.3×10^6≤18.4×1400×x×(1550-x/2)
    1.1×24.34×10^6≤18.4×1400×x×(1550-x/2)
    1.1×4876.5×10^6≤18.4×1400×x×(1550-x/2)
    2≥m^2＋2m≥0
    m^2＋2m≥0
    m^2＋2m＜2

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