2*x-lnx-2=0
    lgx=0.382
    10lg(10^2.77+10^1.7)
    10lg(10^2.81+10^6.98)
    x^2+25=(1+x)^2
    1.4183=-0.02630*x^2+0.0888*x+1.3573
    1.416=-0.02630*x^2+0.0888*x+1.3573
    1.4121=-0.02630*x^2+0.0888*x+1.3573
    1.3956=-0.02630*x^2+0.0888*x+1.3573
    4/45*470/L^0.84 = 1/470（0.021*L^1.85+0.25*21.85^2)^0.5
    1.3863=-0.02630*x^2+0.0888*x+1.3573
    cot 0.32
    1.3656=-0.02630*x^2+0.0888*x+1.3573
    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

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