8x/((x-6.35-x/100)^3*(6.35+x/100)*3.1415926) <3.546
    3.1415926*8x/((x-6.35-x/100)^3*(6.35+x/100)) <3.546
    8x/((x-6.35-x/100)^3*(6.35+x/100)) <3.546
    8x/((x-6.35-x/100)^3*(6.35+x/100))<2
    -3+6a-a^2+6≥0
    a^2-6a-3≤0
    x^2+x-2≤0
    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

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