（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
    （√3+1）÷2×x×e^（arcsin（x/2））≥1
    （√3+1）÷2×x×e^（arcsin（x/2））＞1
    2x-54x^-2<0
    39.99-0.05x>=29.99
    (1+A+0.65)*1.326^2+15>(1+A)*1.326^3
    35+x>=50
    1800-x>=1250

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