x/400>5*75.283*x*x*x*x/384/7.5/1000000/0.018/0.018*12
    x/400>5*69.713*12*x*x*x*x/384/7.5/1000000/0.018/0.018
    -4082750+300000+a-a*10%/4-450000=30000
    e^x-1-x-0.849x^2<0
    e^x-1-x-1.177x^2<0
    （2x-3）*（5x^2+45）^1/2≤0
    2x-3*（5x^2+45）^1/2
    e^x-1-x-x^2<0
    e^x-1-x-x^2>0
    3x^2-599x=23600<0
    2x^(2)减3x减4大于0
    e^x-0.85x^2-x-1<0
    e^x-1.3x^2-x-1<0
    e^x-x^2-x-1<0
    40*x-0.000000125*(2x+4600)^3≥20000
    40x-0.000000125*(2x+4600)^3≥20000
    40x-0.000000125*（2x+4600）^3≥10000
    40x-0.000000125*（2x+4600）^3≥20000
    (2x-1)/3>-x-5/2
    2x-1>0

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