ln(x^4+5x^3+x^2-7x+28)<0
    200-0.4x<0
    200x-0.2x^2>0
    1<=3^x
    1<=3^x<=3
    (x^4+1)^(1/2)+x^3-3x<0
    x^2-13x+30≤0
    (4x^3-4x)*e^(x^4-2x^2+1)<0
    e^x-4x^3>0
    200*2^x≥921375000
    0.162×x^0.4+4.629×10^(-4)×x=5.229>=4000
    200*2^x≥180000
    x^(9/8)+27.06x^(13/24)≥399.47
    √3/n≥1/2
    x+1≤3
    x-1/2＜1+x/3
    3x-1/2+1≧x
    2x-1＜5
    3x+1＜2+x
    3+2x≧5-x

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