(-4-4a)*(a^2+2a)<=0
    638.32≤22.4*2.22*X*（1.39-X/2）*1000
    638.32≤22.4*2.22*X*（1.39-X/2）
    638.32≤22.4*2.22*（1.39-X/2）*1000
    (x-5)/x＞0.55
    （x-5)/x＞0.55
    （5-y)/5＞0.55
    0.1/5000+0.9/10000>=1/(10000-x)
    (x-5)/2+1>x-3
    x-5/2+1>x-3
    4x-2>=3(x-1)
    180x<180+486+135(x-4)
    e^
    e^=-0.15
    1103.72×10^6≤13.8×2000x(1450-x/2)
    2594.54×10^6≤13.8×2000x(1450-x/2)
    1422.58×10^6≤13.8×2000x(1450-x/2)
    (2000-50n)/2.5n>=1.65
    (2000-50n)/√2.5n>=1.65
    4333.74×10^6≤13.8×2000x(1450-x/2)

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