（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
    （27.134+x）×0.85＝54.268+72.203-x
    （27.134+x）×0.85＝54.268+73.203-x
    （27.134+x）×0.85＝54.268+74.203-x
    （27.134+x）×0.85＝54.268+75.203-x
    x(x+1)=2024
    x+x*0.01=6102.5
    1.8X+2.4=2X-1
    x
    12x^4+18x^2+12
    x(3+2x)^2＝1.12*10^7/0.005
    X（1-60%）-2500=1415
    0.005-x/x（2.98+2x）^2＝2.09×10^13
    0.005-x/x(3-0.02+4x)=2.09×10^13
    0.005-x/x(3-0.02+4x)
    x+x*0.13=1300
    x+x*0.13=1616

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