3x^2+20x+9=0
    -1.051020160524977 =（1/x）*ln（1-x）
    -1.094055322371954=（1/x）*ln（1-x）
    W-W×2%=18000
    x*x-2=0
    x*x-1=0
    x*x*x*x-x*x*x-x*x-x-1=0
    12/x - 12/(x+4) =0
    W-W*2%=22000
    (7600-((10000/70)-(27600/(x+70.4)))*(x+70.4))/(x+10.4)+(10000/70)＝150
    1/x=4
    1/x+4
    (10000-((10000/70)-(27600/(x+70.4)))*(x+70.4))/(x+10.4)+(10000/70)＝150
    (10000-((10000/70)-(27600/(x+10.4+60))*(x+10.4+60)))/(x+10.4)+(10000/70)＝150
    25-25X+0.5+2.5X = 24
    30-30X+2.1+3X = 26
    -arctanx-arctan0.2x-arctan0.1x=-180
    x^2 - 5x + 6 = 0
    30-30X+2.1+3X=26
    2b^2 - 5b + 4 = 0

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