（1050*12-70%* 60X*7.2%）/(30%*60X+2%*60X)
    （6813-x）/（21212-x）=0.28
    x/30-30=0.4x/30+0.6x/52
    x*ln(x/180)=60.5
    25+3.3^2=x
    10lg(10^2.81+10^5.13)
    41.77778=(0.021*L^1.85+0.25*21.85^2)^0.5*L^0.84
    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

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