46800+(X-600000)*0.0741>19600+(X-400000)*0.0466
    30960+（X-720000）*0.04085>19600+(X-400000)*0.0466
    tan(180-2x)>0.5
    x^2-4x+4-4x^2-12x-20>0
    x-0.025x=23300
    80a-50（80-a）≤4520
    -tan(2*x)>0.5
    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

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