2800/30*8+x/12=4167
    x/21.75*8+x/12=4167
    2x^2+12x+10=0
    4/3x-3<1-2/3x
    x=arctan(9.8/4.2)
    tanx=9.8/4.2
    atan(x/15)-atan(x/2)-atan(x/(200*(1-x^2/10000)))=-π/4
    2（x-1）≤3x-1
    arctan（x）+arctan（x/2）+arctan(x/3) = 180
    1-x<2
    arctan（x）+arctan（x/2）+arctan(x/3) = 360
    1-3<2
    atanx+atan（0.1x）=90*3.1415926/180
    arctan（x）+arctan（x/2）+arctan(x/3) = 3.14
    1/2（x-1）≤1
    arctan（x）+arctan（x/2）+arctan(x/3) = π
    （7—x）y≤4x y<0
    arctan（x）+arctan（x/2）+arctan(x/3) = 3.1415926
    2x<-2
    arctan(0.08*x)-90-arctan(0.2*x)-arctan(0.005*x)arctan(0.04*x)=-180

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