1≥arccos（2x-3）≥-1
    x+1/x≦2
    x+1/x≦2
    3x²－260x＋43100≤0
    x²－2x－15＜0
    100(0.78-p)/(100p(1-p))^0.5＜1.96
    100(0.78-p)/(100p(1-p))^0.5＜1.96
    3c-2＞c
    4^x-3*2^x-4>0
    3^x-x^3<0
    e^x（2x-2+cosx-sinx）<-1
    3x-11x+6≥0
    0.9x-234＜0.6(x-234）
    0.9x-234＜0.6(x-234）
    x²－4x＋4＜0
    -2
    x/（x^2+5）≥17/77
    x/（x^2+5）≥0.286571342856970856
    (2x+5)÷(x+1)≤1
    2x+5/x+1≤1

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