a*a-156*a-12800>0
    (a+100)(a-128)>128a
    (a+100)(1-128/a)>128
    128<(x+100)(1-128/x)
    (1-128/x)*128<(x+100)
    (1-128/x)*128
    (1-128/x)/128
    (-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^

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