26-x=20lg0.5
    180-90-arctanx-arctan(0.1x)=60
    26/lgc=40
    arctan(x/5)-90-arctanx-arctan(x/100)=-180
    100*sqrt(1+0.04x^2)/(x*sqrt(1+x^2)*sqrt(1+(0.01x)^2))=1
    2.5=x*sqrt(1-0.25^2)
    20lg(1/(2x*sqrt(1-x^2)))=6
    66.7*x/2000/100 = 0.05
    2000*x-2000*200-2000*X*5%=2000*200*20%
    2000*（X-200）*0.95=2000*200*20%
    96+3x=118-4x
    x=x/1.06*0.06+x/1.06*0.06*0.11+x*0.0003+3923.81+20600
    133*x/2000/100=0.04
    133*x/2000/100=0.05
    133*x/2000/100=0.1
    X+133*x/80=100
    X+133*x/100=100
    X+133*x/200=100
    3x^2+6x-8=0
    5385.78=1118434.58*0.26%*（1+0.26%）^x/[(1+0.26%)^x-1]

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