abs(x-2)-abs(4-2x)<=-1
    abs(2x-3)<=x+1
    x/(x+1)<0
    abs(x/(x+1))>x/(x+1)
    x+1>2/x
    60/(x+20)+1+40/(x-20)<=5
    (x+2)/(x*x-5x-6)>=0
    2-3x>0 1>=2-3x
    19296＜0.995W＜19396
    6-3x+6≥4+2x
    x^3-x^2+1≤0
    3x＋7(12-x)<＝61
    -1/a>1
    -1/a<1
    X^2+50x-10000＞0
    0.05x+0.005x*x>10
    0.1x+0.01x*x<12
    x+4<42
    （x+2）（x-3）≤0
    （x+2）（x-3）≥0

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