(x+2)(2-x)>0
    (2x-3)(x+1)>0
    -x^2+x+6<0
    y^2+3y-4<0
    x^2-7x+12<0
    x-1/2+2x+3/3<5 3x+2/3-4x-1/5>6
    {x-4<2 {3x+1>5 {2x+6<35
    x-4<2 3x+1>5 2x+6<25
    3(x-2)<2(2x+1)
    2x-1<3
    abs(x/2-0.7)
    3（x-1）-1≥x-8
    x-3<2/x-3
    (1-x)^5*1/5+[1-(1-x)^5]*(1+1/5)<1
    -2x+1>0
    3-2x>=9+4x
    (15180-13x)×1000/(5000000-(15180-13x)/1.518) ＜0.02
    x
    a>-5/4 a-4>0
    16x+4(600-x)<7000

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