（1860×49.95%＋x）÷（1860＋x）＝51%
    （x+0.5)/ln((40.3+0.5)/(40.3-x)) =30.318
    （x+0.5)/ln((40.3+0.5)/(40.3-x)) =34.702
    （x+0.5)/ln((40.3+0.5)/(40.3-x)) =37.605
    （x+0.5)/ln((40.3+0.5)/(40.3-x)) =39.183
    （x+0.5)/ln((40.3+0.5)/(40.3-x)) =40.352
    （x+0.5)/ln((40.3+0.5)/(40.3-x)) =41.02
    （x+0.5)/ln((40.3+0.5)/(40.3-x)) =41.213
    7/3x=6/5
    8.5a+5.25(9-a)=63.5
    x+2x+4x+2x+3x+3x+3x=300
    x+2x+4x+2x+3x+3x+3x=218
    s^5+2*s^4-s-2=0
    0.0004*X*X+0.0003*X-0.000002=0
    0.0004*X*X+0.0003*X-0.0000005=0
    s^4+20*s^3+4*s+100=0
    0.0004*X*X+0.0003*X-0.000001=0
    s^4+2*s^3+3*s^2+6*s+2=0
    3.243*X*X+0.9651*X-0.00002=0
    30（0.8x-60）≥2000

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