（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
    m2＋2m＜2
    sin(x)<1
    sin(x)<0.927
    sinx>1
    (1+1/x)^x
    2^x＞x^4
    85<170/3+(1/3)x<=90

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