Mathematics
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    (x-4)/(x+9)>0
    (3x-1)/x<1
    x^2>1/3x
    (2m+1)^2-4(m^2)-4>0
    ((x-50000)/50000)*1.033-1.9(9200000+190x+300000)/(50000*350)-1>0
    (x-50000)/50000*1.033-1.9(9200000+190x+300000)/(50000*350)-1>0
    (x-50000)/50000*1.033-1.9(9200000+190x+300000)>0
    (x-50000)/50000*1.033-0.0369(x-50000)*190/300000>0
    (k-1)^2-4*(2-k)>=0
    k^2-8k-7>=0
    (4-2*(2k-1))/(2k-1)>=2k-1
    (4-2*(2k-1))/2k-1>=2k-1
    4-4(2k-1)>=0
    C(200,n)(0.02^n)*(0.98^(200-n)<0.01
    C(200,n)(0.02^n)*(0.98^(200-n)*0.02<0.01
    4x^2-4x<0
    2a^3+12a^2+30a+28>0
    (e^x)×(cosx-sinx)≥1
    e^x×(cosx-sinx)≥1
    (x-1)×e^(π/2)≥1

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