x+4/3-3x-1/2大于1
    8(x+1)>100
    x^2<1
    1-x^2>0
    1-x^2>1
    9-x^2>=0
    -1<=x+1<=1, -1<=sinx<=1
    -1<=x+1<=1 -1<=sinx<=1
    -1<=x+1<=1
    -1<=sinx<=1
    -1<= x+1 <=1
    (2x+1)(x-2)>0
    2x+1>0
    cosx＞1/2
    -30*x+872*x-760.5>720
    202<=12x+10(20-x)<=206
    (2x+1)/3-(1-x)2<1
    5x-2>=3x-4
    10x-5(20-x)>100
    (3x-7)>=4x-23

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