arctan(x/2)-arctan(x)-arctan(50x/(625-x^2)) =arctan (0.839)
    arctan(x/2)-arctan(x)-arctan(50x/(625-x^2)) =arctan(0.839)
    arctan(x/2)-arctan(x)-arctan(50x/(625-x^2)) =arctan(-0.839)
    arctan(x/2)-arctan(x)-arctan(50x/(625-x^2)) =-140
    360/(4x)+3=360/(3x)
    360/4x+3=360/3x
    x+80+0.2x+（1.2x）*13%=2000
    X+X=4
    x^2-2x+1
    x^2-2x+1
    －x(lnx)^2
    X（70+2-2X）=640
    1/x- 2x
    (110.4+x)/(102468.15+x)=2%
    (110.4+x)/(102468.15+x)=10%
    3800x−200−200x=0
    3800*x-200*(1+x) = 0
    3800*x-5000*(1+x)*0.04=0
    (5600-1800)*x-5000*(1+x)*0.08*(1-50%)=0
    5=-4k

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