10*x^4+x^3-10*x^2-10=0
    ( 15 + 2x ) ( 10 + 2x ) = 15 × 10 × 5/3
    1/(1-0.759)×ln((1-0.759)×(0.025-1.23*0.0086)/(x-1.23×0.0086))+0.759 = 8.439
    1/(1-1.9926)×ln((1-1.9926)×(0.025-1.23*0.0086)/(x-1.23×0.0086))+1.9926=8.439
    ln(x)/x=ln(3)/3
    1/1-1.9926×（ln((1-1.9926)×(0.025-1.23*0.0086）÷(x-1.23*0.0086)))+1.9926=8.439
    X+(x*.13)=724500.00
    tancps0.6
    4x^3 + 72x^2 + 200x + 40 = 0
    x^2+0.00018x-0.000018=0
    x^2/(0.1-x)=0.00018
    ㏑(1+x/1)
    tanx＝0.75
    3x^2 + 6x + 2 = 0
    x-[(x-5000)*0.1-210]=12500
    x-[(x-5000)*0.1-210]=13000
    x-[(x-5000)*0.1-210]=16200
    x*x=9
    x-[(x-5000)*0.1-210]=10500
    x-[(x-5000)*0.1-210]=13500

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