（1+5x）^(-4)-0.1<1-20x<（1+5x）^(-4)+0.1
    3x-5x^2/（10x-3）＞0
    3x-5x^2/（10x-3）＜2/5
    x^2-2x≤4x/x+1
    -11x²+30x+9＞0
    3x²+2x-1＞0
    3x²-13x+16≤0
    x²+10≥6x+1
    4x²≤x²+1
    5x²-x-6＜0
    2-6x≤4
    5+2x≤-3
    5+2x≥3
    5+2x≤-3
    5+2x≥3
    (x+1)/(x-2)>0
    2x-3/x+1<0
    x-1/2x+1<0
    1-x/2x+1<0
    x^2+x-2<0

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