tan(2*x)>0.5
    10a
    x+2>=0 1-2x<=0 x+2>2x-1
    (x+2)^-4<(1-2x)^-4
    x+2<=0 1-2x>=0 -(x+2)>1-2x
    x+2><=0 1-2x>=0 -(x+2)>1-2x
    x+2>=0 1-2x<=0 x+2>-(1-2x)
    x+2>=0 1-2x>=0 x+2>1-2x
    sqrt（9+m）（18+m）>162
    1-2x<-2-x≤0≤x+2
    x+2<1-2x≤0
    1-2x≥0≥x+2>2x-1
    x+2>1-2x≥0
    π*x-2.3*sqrt(1-x*x)≥0
    (x+2)^(-4)<(1-2x)^(-4)
    abs(x+2)>abs(1-2x)
    3x^2-4x>0
    x*0.3+30= x*0.6
    28<0.5a+1.5(30-a)<30
    －x^(2)＋x-4<0

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