X-（X-27）+（X-25）=3
    x*x=-1
    x*x=0
    15x^2-64x+64=48
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.365)
    1-a/(1.66+a)+1/6.28318530718sin(6.28318530718a/(1.66+a)) = 1/(2*1.45)
    {[10x+（330-25+183.36+10）-（10x*0.13-25）*0.1]*0.75}/700=7%
    [10x+（330-25+183.36+10）-（10x*0.13-25）*0.1]*0.75/700=7%
    [10x+（330-25+183.36+10）-（10x*0.13-25）*0.1]*0.75/700
    300000*0.9^x*0.99^(12*x)*0.999^(365*x)=30000
    58228.37 = 8155066.59*x^2+250033.2*x
    12609=5551652.47*x^2+206298.02*x
    282.8= sqrt(220^2+(100*3.14159265*x*9.09)^2-2*220*100*3.14159265*x*9.09*(-0.19899))
    79975.84 = 48400+(314.159265*x*9.09)^2-440*314.159265*x*9.09*(-0.19899)
    282.8^2=220^2+(100*3.14159265*x*9.09)^2-2*220*100*3.14159265*x*9.09*(-0.19899)
    31575.84=8155066.59*x^2+250042.61*x
    （477.1-420.8/x）(0.966-0.05/x)+144-286.1/x=0
     32^x-31^x = 63
    sinx-cosx
    （27.134+x）×0.85＝54.268+71.203-x

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