x +0.15x=23000
    x +0.15x=23000
    x +0.15x=23000
    x +0.15x=23000
    x +0.15x=23000
    x +0.15x=23000
    x +0.15x=23000
    x +0.15x=23000
    x +0.15x=23000
    x +0.15x=23000
    x +0.15x=23000
    0.405*{（x-sin（2πx）/2π）+（3x-1.25）*0.139}＝2/3*{（sin(πx）)^3/π}+0.139*446/500*{sin(πx)+sin(1.25π-2πx）}/π
    x^2-8x+15=0
    ㏑x-（x/3）=0
    ㏑x-（x/3）
    ㏑x-x/3
    x＾3-3x＾2+2
    (-0.0089x+315.58-(-0.000014x^3+0.018053x^2-7.640781x+1364.077580))(x-300) = ((-0.000014x^3+0.018053x^2-7.640781x+1364.077580)-(0.0053x+284.09))(470-x)
    y^3-3y^2+1=0
    -0.0089x + 315.58-(-0.000014x^3+ 0.018053x^2-7.640781x+1364.077580)(x-300)=((-0.000014x^3+ 0.018053x^2-7.640781x+1364.077580)-(0.0053x + 284.09))(470-x)

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