x（e^x-2）=0
    -arctanx-arctan2x=-π/2
    -arctanx-arctan2x=-π
    0.137X^-3+0.119X^-2+0.267X^-1-0.019=0.43
    0.137X^-3+0.119X^-2+0.267X^-1-0.019=0.17
    s(s+2)(s+4)+1＝0
    s(s+2)(s+4)＝0
    0.137X^-3+0.119X^-2+0.267X^-1-0.019=0.9872
    0.137X^-3+0.119X^-2+0.267X^-1-0.019=0.99
    0.137X^-3+0.119X^-2+0.267X^-1-0.019=0.8884
    0.137X^-3+0.119X^-2+0.267X^-1-0.019=0.5923
    0.137X^-3+0.119X^-2+0.269X^-1-0.019=0.44
    0.137X^-3+0.119X^-2+0.269X^-1-0.019=0.9872
    0.137X^-3+0.119X^-2+0.269X^-1-0.019=0.89
    0.137X^-3+0.119X^-2+0.267X^-1-0.019=0.44
    x^2-9x+16=0
    x^3+2x^2+2x=0
    2x^3+11x^2+20x+8
    50+（50X0.2）=X
    (2x-2)/㏑x

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