0.25x^6+x^4=20
    0.25x^6+x^4
    2760x×x×x-938400x×x+229936080-63788803584=0
    x^2+sqrt（0.25x^2+1）=20
    xln(x/0.82)＝0.112
    xln(x/0.82)＝0.112
    xlnx/0.82＝0.112
    (40+x)/(20+x)=182.96/105.6
    （X-10%）/（15%-X）=200/100
    200-（15%-X）=100-（X-10%）
    x^2*1.45286*10^-6-x*7.83213*10^-4+1.42185=1.3621
    x^2*1.45286*10^-6-x*7.83213*10^-4+1.42185=1.3631
    x^2*1.45286*10^-6-x*7.83213*10^-4+1.42185=1.3655
    x^2*1.45286*10^-6-x*7.83213*10^-4+1.42185=1.3699
    x^2*1.45286*10^-6-x*7.83213*10^-4+1.42185=1.3760
    x^2*1.45286*10^-6-x*7.83213*10^-4+1.42185=1.3835
    x^2*1.45286*10^-6-x*7.83213*10^-4+1.42185=1.4228
    x^2*1.45286*10^-6-x*7.83213*10^-4+1.42185=1.4216
    x^2*1.45286*10^-6-x*7.83213*10^-4+1.42185=1.4240
    x^2*1.45286*10^-6-x*7.83213*10^-4+1.42185=1.4068

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