0.47x-0.0748sin（πx）+0.2256x-0.094=0.2122（sin（πx））^3+0.0448sin（πx）+0.0448sin（π（1.25-2x））
    3/x-3/(x*(1+x)^20)+100/(1+x)^20=96.7
    0.259246=e^x
    0.259246=e^x-e^(-x)
    0.259246=e^x+e^(-x)
    0.259246=e^x
    lnx=1/（x－1）
    xlnx=1+lnx
    xlnx=1+lnx
    50*7.27*(x-0.8)^2-20*11*(x-2.3)^2=0
    50*7.27*(x-0.8)^2-20*11*(x-2.3)^2=0
    50*7.27*(x-0.8)^2-20*11*(x-2.3)^2=0
    50*7.27*(x-0.8)^2-20*11*(x-4)^2=0
    X/126-2/44.7-(93-X)/500=0.238
    lnx=x-2
    （16.21*1000+0.1361/x/x)*(x-0.0385*0.001) = 189*8.3145
    （16.21*100000+0.1361/x/x)*(x-0.0385*0.001) = 189*8.3145
    （16.21*1000000+0.1361/x/x)*(x-0.0385*0.001) = 189*8.3145
    (16.21*1000000+0.1361/x/x)*(x-0.0385*0.001) = 189*8.3145
    （16.21*1000000+0.1361/x/x)*(x-0.0385*0.001) = 189*8.3145

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