31.3-x+x×6%/4≥50
    ln(2n^2)<4.5
    25n^2-5001n+2500>0
    25n*2-5001n+2500>0
    2<12÷x<3
    x×x－3x＋5＞0
    0<0.5-2x<1
    2x>34
    3^x＞5*x
    a^2+2a+1>2
    3x^3+15x^2-42x>0
    3x^3-15x^2-42x>0
    -x＾2-x+6≥0
    -x^2+14*x-24＜=0
    100x-85＞2.054sqrt（100x-100x^2）
    1000-10*x>2.05*sqrt(x)
    3x-2＞20
    (2x+7)/(5x-3)≤0
    -3n+62≥0
    1≤-1/a

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