10x-5（20-5x）<120
    10x-5（20-5）<120
    (2-x)/(x+4)>0
    （9%-8%）/（9%-i） = （5.6044-4.6610）/（5.6044-5）
    x^(2)减3x减10小于0
    10m+15(100-m)<1150 m<3(100-m)
    3x+5≥0
    -2x≥0
    4x-3≤1
    （1/2）x>（1/3）x
    2x>1
    2x^(2)-3x^(3)+12≥0
    1/x大于1
    6k-3k^2+1>=0
    （X-2293.5）/X*100%=0.025
    x/2-x-1/3>0
    3(x+1)<2x+3
    8x(x+9)=112
    5/x+13
    2/y+1

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