arctanw+arctanw/2+arctanw/3=180
    1/6*(x-1)-2.185*e^(0.014*x)-2=0
    1/6*(x-1)-2.185*e^(0.014*x)=0
    3x2-5x+2
    1/42*(x-1)-2.185*e^(0.014*x)-2=0
    1/6*(x-1)-2.185*e^(0.014*x)-2=0
    1/42*(x-1)-2.185*e^(0.014*x)=0
    2x-3（4x-9）=x-6
    2x-3（4x-9）=x-6
    1/6*(x-1)-2.185*e^(0.014*x)=0
    0x=1
    6x+5(500-x)=2800
    2x-3（4x-9）=x-6
    2x-3（4x-9）=x-6
    2x-3（4x-9）=x-6
    arctan10x+arctan2x＝61
    arctan10x+arctan2x＝60
    10x+50(x-8)=800
    arctan10x＝60
    arctan10x＝60

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