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
    (e+1)^n-e^n>(2＾n-2）e＾（n/2）+1
    40000*（x-18）-304000＞144000
    1/x-2x>0
    x^2≤0
    lg（m2-2m-1）>0
    31a>98+5
    x-3>5
    -55+X-X*4%/4-5≥10
    2x-1/3-4+x/2＞-3

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