（abs(x+5)）/(abs(x-3)) ≤x
    （1-abs(x)）/(2*abs(x)-3)≤0
    1.94＜(50sin(2x)-39.2)/(1+cos(2x))＜2.44
    1.94＜(50sin2x-39.2)/(1+cos2x)＜2.44
    1.94＜(50sinx-39.2)/(1+cosx)＜2.44
    -1≤1/（X+1）≤1
    (1-x)/(3x+5)≥0
    x(x+2)>x(3-x)+1
    -3(x^2)+5x-4>0
    1-lnx+1/x＜0
    -6x-7>2x+9
    3x-2>16
    3x+6+x<=88
    3(2-2x)>-5(4-x)
    1.6/((10-x)*1.6+55)＜0.5/(26+0.5*x)
    1.6/((10-x)*1.6+55)＜0.5/(16+0.5*x)
    (10-x)*1.6/((10-x)*1.6+55)＜x*0.5/16
    (10-x)*1.6/((10-x)*1.6+55)＜x*0.5/26
    (10-x)*1.6/((10-x)*1.6+55)＞x*0.5/26
    （a-1/2）^2≤5/4

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