5385.78=118434.58*0.26%*（1+0.26%）^x/[(1+0.26%)^x-1]
    （26.448+x）×2.75＝52.895+71.143-x
    （26.448+x）×2.55＝52.895+71.143-x
    （26.448+x）×2.35＝52.895+71.143-x
    （26.448+x）×2.15＝52.895+71.143-x
    （26.448+x）×1.95＝52.895+71.143-x
    （26.448+x）×1.75＝52.895+71.143-x
    （26.448+x）×1.55＝52.895+71.143-x
    24x-2x²=40
    a*1.85-8-a*8=0
    1/2x(x-1)=15
    a（a+15）=4（2a+15）
    x(x-1)+(x+1)(x+2)=0
    -90-arctan(x/2)-arctan(x/20)=-180
    sqrt(2)=x^2*(1+(sqrt(2)-1)^2*x^2)
    3x²+1=6x
    arctanx-90-(180-arctan(x/(4(x^2-1))))-arctan0.1x=-180
    20lg(1/(2x*sqrt(1-x^2)))=8
    180-90-arctan10x-arctan0.1x=30
    x*sqrt(1+100x^2)*sqrt(1+0.01x^2)=10

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