（-360000-3600x ）÷(181800000+180x）=0.0025
    （-360000-3600x ）÷(181800000+180x）=0.0025
    （-3600-3600x ）÷(18180000+180x）=0.0025
    x^3(8-6x)-1=0
    x^3(1/3-1/4x)-6=0
    arctan(0.3*x)-arctan(x)-2*arctan(0.1*x)=0
    arctan(0.3*x)-arctan(x)-2*arctan(0.1*x)=-90
    arctan(0.3*x)-arctan(x)-2*arctan(0.1*x)=-90
    180（n-2）+360÷n=1100
    x=5x+3
    arctan(0.3*x)-arctan(x)-2*arctan(0.1*x)=180
    arctan(0.3*x)-arctan(x)-2*arctan(0.1*x)=0
    x/5=55
    arctan(0.3*x)-arctan(x)-2*arctan(0.1*x)=90
    x^2+6=10
    x/5+3=x/6+4
    x/5+3
    （x/0.57）²-x²=[√2(11.7-x)]²-(11.7)²
    (x-0.8)²+2.4*2.4=xx
    8x^3-6x+1=0

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