x^2-2x-15＞0
    （x-3）^2≥4
    4x^2+4x+1＜0
    x^2+x＞12
    (a-1)/(2a)>2
    a-1/2a>2
    ex＜xe
    C(100,x)*(0.98^x)*(0.02^(100-x)) > 0.95
    0<=25x-4.9×625/400×(1+x^2)<=3.44
    0<=25x-4.9/400×625×(1+x^2)<=3.44
    tan(x)-x/180=0.5/637100000 x<90
    3x+2（x-1）>13
    4x+6＜5
    x（x－1）≥40
    (x-1)(x-2)^2abs(x-3)/(x-4)≥0
    1-3∧x＞0
    abs（1-x^2)<1
    n<8lgn
    100(n^2)>2^n
    3x≤2/4x-1

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