(0.639+0.141e(-2.3166x))/(0.639+0.141e(-2.106x))>0.99
    1+3/5*x+8/5*x*x≥1.026
    (1-x)*100*100*(1+8/5*x) ≥10260
    ((1-x)*100-80)*100*(1+8/5*x) ≥10260
    (1-x)*20*100*(1+8/5*x)≥10260
    8*x^2+17/5*x+4.13
    0.72x^2-12x+32≤0
    0.72x-12x+32≤0
    (1-x)/(2+x)≥1
    (3%-2%）/(3%-X) = (113.738-118.851)/(113.738-116.4)
    26700+x*（1-10%/4）=50000
    26700+x-（x*10%/4）=50000
    26700+x-x*10%/4=50000
    1-x/2+x≥1
    (1-0.187e(-1.923x))/(1-0.187e(-2.1153x))>0.9
    x^2-x<0
    (1-0.187e(-1.923x))/(1-0.187e(-2.1153x))<1.01
    ln(1644.753x+1)/ln(1495.23x+1)<1.01
    ln(205.7506x+1)/ln(187.046x+1)<1.01
    ln(205.7506x+1)/ln(187.046x+1)<0.01

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