470/L^0.84*4/45 = 1/470（0.021*L^1.85+0.25*21.85^2)^0.5
    53加30%x等于74
    tan x=1/3
    1.3612=-0.02630*x^2+0.0888*x+1.3573
    470*4/45 = （0.021*L^1.85+0.25*21.85^2)^0.5*L^0.84
    1.3593=-0.02630*x^2+0.0888*x+1.3573
    49/440 = 1/470（0.021*L^1.85+0.25*43.7^2)^0.5*L^0.84
    49/440= 1/470（0.021*L^1.85+0.25*35.3^2)^0.5*L^0.84
    x^(2)+4x＝8＋6√5
    4/45 = 1/470（0.021*L^1.85+0.25*21.85^2)^0.5*L^0.84
    4/45 = 1/470（0.021*L^1.85+0.25*18.75^2)^0.5*L^0.84
    1.4192=-0.02630*x^2+0.0888*x+1.3573
    1.4185=-0.02630*x^2+0.0888*x+1.3573
    1.4166=-0.02630*x^2+0.0888*x+1.3573
    4/45=1/470（0.021*L^1.85+0.25*21.85^2)^0.5*L^0.84
    1.4001=-0.02630*x^2+0.0888*x+1.3573
    1.3965=-0.02630*x^2+0.0888*x+1.3573
    1.3934=-0.02630*x^2+0.0888*x+1.3573
    1.3868=-0.02630*x^2+0.0888*x+1.3573
    1.3716=-0.02630*x^2+0.0888*x+1.3573

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